CBD Oil For Dry Eyes


Buy CBD Oil Online

THC Regulates Tearing via Cannabinoid CB1 Receptors This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. Associated Data CBD is a chemical found in marijuana that is considered medicinal, and it has been advertised as a treatment for many issues, including glaucoma. Learn why CBD does not actually work well for eye treatment. Can Cbd Oil Help With Dry Eyes | Adam Fields differences in time and temp making cbd oil or cbd butter in mb2e Can You Get High Off Cbd Oil, 2021-06-30 Cbd Joint can cbd oil help with dry eyes

THC Regulates Tearing via Cannabinoid CB1 Receptors

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Associated Data



Aqueous deficiency dry eye (ADDE) is a chronic condition affecting millions, with symptoms ranging from a dry itchiness to blurred vision and accompanied by an increased risk of eye infections. ADDE typically arises from disorders of the lacrimal gland that produces tears necessary for eye lubrication. Cannabis users frequently report dry eye, but the basis for this is unknown. If the effects occur via the endogenous cannabinoid signaling system, then this may represent a novel mechanism for the regulation of tearing.


We examined expression of cannabinoid CB1 receptors in the lacrimal gland using immunohistochemistry, Western blotting, and PCR and tested tetrahydrocannabinol (THC) regulation of tearing in wild-type and CB1-null mice.


We now report that CB1 receptors are expressed in the axons of cholinergic neurons innervating the lacrimal gland. Little if any staining is seen in lacrimal gland epithelial cells (acinar and ductal) or myoepithelial cells (MECs). Activation of CB1 receptors by THC or the cannabinoid agonist CP55940 reduces tearing in male mice. In female mice, THC has no effect, but CP55940 increases tearing. In both sexes, the effect of CP55940 is absent in CB1 knockout mice. CB1 mRNA and protein levels are approximately four- to fivefold higher in males than females. In male knockouts, THC increases tearing, suggesting that THC also acts through different receptors.


Our results suggest a novel, albeit sex-dependent, physiologic basis for the dry eye symptoms experienced by cannabis users: activation of neuronal CB1 receptors in the lacrimal gland reduces tearing.

The lacrimal gland is an exocrine gland that produces the aqueous layer of the tear film. 1 Deficiencies in aqueous tears may lead to aqueous deficiency dry eye (ADDE). In humans, ADDE is a common condition that affects more than 10 million Americans 2 and can lead to blurry vision, eye pain, photophobia, itchy eyes, and red eyes. 3 The annual burden of dry eye disease, which includes ADDE, on US health care is estimated to be in excess of $3.5 billion; on average, afflicted individuals spend more than $750 per year managing their symptoms. 4 Many factors can influence chances of individuals developing the disorder, the most common of which are older age, female sex, use of antidepressant medication, and some autoimmune diseases. 5 Lack of proper ocular lubrication can also lead to increased infections, chronic inflammation, affected vision, and corneal abrasions. 6 Additionally, there is a feedback loop between the cornea and the lacrimal gland, whereby damage to the cornea results in tear reduction, further exacerbating the problem. 7 Lacrimal gland secretions are under neuronal control, including sympathetic and parasympathetic innervation of the gland as well as brain regions such as the superior salivatory nucleus in the brainstem (reviewed in Dartt 8 ).

Changes in the legal status of cannabis in Canada and many US states have been accompanied by increasing use of cannabis, but the ocular effects of cannabis consumption are still largely unknown due to limited research. Cannabis users commonly report dry eye, 9 but the mechanism by which cannabis regulates tearing is unknown. Tetrahydrocannabinol (THC), the chief euphoric component of cannabis, has been shown to act by engaging an endogenous cannabinoid signaling system. This cannabinoid signaling system consists of the cannabinoid receptors CB1 10 and CB2, 11 lipid messengers 2-arachidonoyl glycerol (2-AG) and anandamide, 12 , 13 and enzymes that produce and metabolize these messengers (reviewed in Murataeva et al. 14 ). The cannabinoid signaling system may also include several related receptors: GPR119, 15 GPR55, 16 GPR18, 17 and perhaps TRPV1 since anandamide is a full agonist at this receptor. 18 The cannabinoid signaling system also exists in the eye, where it has been shown to regulate ocular pressure 19 – 21 and corneal wound healing. 22 – 24

Given the health burden that ADDE represents, investigating a novel mechanism of regulation of tearing might offer insights into some forms of ADDE or even indicate a new therapeutic target for treatment of ADDE. We therefore initiated a series of experiments to clarify how cannabinoids regulate tearing, with results as reported below.



Experiments were conducted at the Indiana University and Scripps Research Institute campus. All mice used for experiments were handled according to the guidelines of the respective university animal care committees and in accordance with the ARVO animal statement. Adult mice (both sexes, aged 3–8 months) were kept on a 12-hour (06:00–18:00) light dark cycle and fed ad libitum. C57BL/6J (C57), CD1, and CB1 knockout (KO) mice were kindly provided by the laboratory of Dr. Ken Mackie (Indiana University, Bloomington, IN, USA). Conventional CB1 null mice (CB1 – / – ) were originally received from Dr. Catherine Ledent (Catholic University, Leuven, Belgium). 25

Measurement of Tearing

To measure tearing in mice, a phenol red thread (Zonequick; Oasis Medical, San Dimas, CA) was positioned at the rear corner of the right eye (the lateral cantus of the conjunctival fornix) for 10 seconds while the animal was held by a second experimenter. Tears discolor the threads for later quantification—more tearing results in a longer discolored portion of the thread. The length of the discolored portion can therefore be taken as measure of tearing, allowing comparison of experimental conditions to baseline conditions. For experiments that tested the effect of drug treatments (CP55940 and THC), animals were injected with drugs intraperitoneally (IP; 0.5 mg/kg; CP55940, 4 mg/kg [THC]) 1 hour before tear measurement.

Pilocarpine injections (7 mg/kg) were done subcutaneously in isoflurane-anesthetized mice. Animals were injected with either vehicle or CP55940 (IP) as above an hour before pilocarpine treatment. Animals were then anesthetized using isoflurane (3% induction, 1.5% maintenance). A baseline tearing volume was obtained as above but for 60 seconds (since the animals were immobile). Animals were then promptly injected with pilocarpine. After 4 minutes, a second 1-minute tearing measurement was taken, followed by another at 8 minutes. We found that 8 minutes was clearly sufficient to elicit an abundance of tears and used this time point for comparison. After this, animals were allowed to recover from isoflurane. After a period of monitoring, they were returned to the colony.


For immunohistochemistry, lacrimal glands were fixed in 4% paraformaldehyde for 45 minutes at 4°C, then placed sequentially in 10% and 30% sucrose in PBS overnight before being suspended in OCT (Thermo Fisher Scientific, Waltham, MA, USA) in a 15-mL plastic test tube, then submerged in cold (–80°C) methanol. Fixed eyes were sectioned on a Leica cryostat (Leica Microsystems, Wetzlar, Germany), and then sections were mounted on Superfrost Plus slides (Thermo Fisher Scientific). Slides were blocked with BSA, followed by treatment with primary antibodies (in PBS, saponin, 0.2%) for 1 to 2 days at 4°C. See Table for a list of primary antibodies. In cases where secondary antibodies were required, a second staining with secondary antibody (∼4 hours at room temperature (RT)) was done after washing off the primary antibody. Appropriate secondary antibodies were labeled with Alexa 488, Alexa 594, or Alexa 647 (Thermo Fisher Scientific). Slides were then mounted with mounting media containing 4′,6-diamidine-2′-phenylindole dihydrochloride to visualize nuclei (Fluoromount; Sigma-Aldrich, St. Louis, MO, USA). Images were acquired with a Leica TCS SP5 (Leica Microsystems) or Zeiss LSM 780 confocal laser scanning microscopes (Zeiss, Jena, Germany). Images were processed using FIJI (available at https://www.imagej.net) and/or IMARIS Image Analysis Software (BITPLANE; Oxford Instruments, Abingdon, UK) and/or Adobe Photoshop (Adobe Systems, Inc., San Jose, CA, USA) software. Images were modified only in terms of brightness and contrast.


Antibodies/Primary Labels Used in This Study

Target Host Source Cat. No. Lot No. Concentration
CB1 Rabbit Immunogenes IMG-pAb001 BM01 1:300
Neurofilament H Guinea pig Synaptic Systems 171104 171104/1-2 1:300
β-actin Chicken Synaptic Systems 251006 1-1 1:300
β3-tubulin Guinea pig Synaptic Systems 302304 302304/6 1:300
Choline acetyl transferase (ChAT) Goat Millipore AB144P 2211015 1:150
Substance P Guinea pig Abcam AB10353 GR3313766-1 1:300
Tyrosine hydroxylase Guinea pig Synaptic Systems 213104 213104/1-5 1:300
VAMP8 Rabbit Synaptic Systems 104302 104302/1-17 1:300
Phalloidin-488 NA ThermoFisher A12379 1749905 1:300
CB1-L15 Guinea pig Ken Mackie NA NA 1:500

NA, not applicable.

Quantitative RT-PCR

Primers for cannabinoid receptor 1 were designed by using Primer-Blast (available at https://www.ncbi.nlm.nih.gov/tools/primer-blast/index.cgi) and the corresponding mouse gene. Primer sequences are listed as follows:

CB1 primers set 1



CB1 primers set 2



CB1 primers set 3



Eyes were extracted and the lenses removed, and they were then immediately stored at –80°C. RNA was extracted with Trizol reagent (Ambion, Austin, TX, USA), and genomic DNA was removed with DNase 1 (NEB, Bethesda, MD, USA) following the manufacturer’s instructions. Reverse transcription was performed using RevertAid (ThermoFisher Balkans, Vilnius, Lithuania). The cDNA products were then amplified using Sybr Green reagent (PwrSybr; Applied Biosystems, Carlsbad, CA, USA). Quantitative PCR was performed with a QuantStudio 7 thermocycler (Advanced Biosystems, Waltham, MA, USA). Primers for glyceraldehyde 3-phosphate dehydrogenase were also used as an internal control for each experimental condition with the threshold cycle set within the linear range (10-fold above baseline). Once the standard critical threshold (Ct) was set, the relative expression levels for genes were determined using the ΔΔCt method.

Western Blot

Lacrimal glands were harvested and frozen on dry ice. Samples were homogenized in RIPA buffer (25 mM Tris, pH 8.0, 150 mM NaCl, 1% sodium deoxycholate, 0.1% SDS, 0.5% CHAPS, 1× HALT protease and phosphatase inhibitor; Thermo Fisher Scientific, #78440) and centrifuged at 10,000 × g for 10 minutes at 4°C. The supernatant was then collected and mixed with 4× sample buffer and incubated for 10 minutes at 65°C and run on a 4% to 12% NuPage gel (Thermo Fisher Scientific, #NP0323BOX). Following protein transfer, blots were stained (Revert Total Protein stain, #926-11011; Li-Cor Bioscience, Lincoln, NE) and scanned for total protein and then blocked in Li-Cor Blocking Buffer (Li-Cor Bioscience, #927-40000) for 60 minutes at room temperature. They were then incubated with guinea pig anti-CB1 L15 antibody (1:500; provided by the laboratory of Dr. Ken Mackie, Indiana University). This antibody targets the last 15 amino acids of the intracellular portion of the receptor. This was diluted in a mixture of Li-Cor Blocking Buffer and 1× PBS (1:1). Blots were incubated with primary antibody overnight at 4°C. The next day, blots were washed 4 × 15 minutes at room temperature in TBST (20 mM Tris, pH 7.5, 150 mM NaCl, 0.05% Tween 20) and then incubated in the blocking buffer above containing Li-Cor donkey anti–guinea pig IR800 antibody (#926-32411) for 1 hour at room temperature. Finally, blots were washed as above and scanned on a Li-Cor Odyssey near-infrared imager. Apparent molecular weights were determined using Chameleon molecular weight marker (Li-Core Bioscience, #928-60000). Band densities were calculated using FIJI software. Bands corresponding to CB1 were normalized to protein density (labeled with Ponceau S) using Excel software (Microsoft, Redmond, WA, USA). Prism 7 software (GraphPad Software, La Jolla, CA, USA) was used for graphing and statistical analysis.


THC was obtained through the NIDA Drug Supply Program. CP55940, SR141716, and pilocarpine were obtained from Cayman Chemical (Ann Arbor, MI, USA). Drug concentrations were determined based on available literature for in vivo studies (e.g., Sain et al. 26 for CP55940).


CB1 Receptors Are Expressed in the Lacrimal Gland of the Mouse

Using immunohistochemistry, we tested CB1 receptor expression in the extraorbital lacrimal gland of the mouse ( Fig. 1 A). Specificity of the staining was confirmed in lacrimal glands from CB1 knockout mice (CB1 –/– ) ( Fig. 1 B). We found that myoepithelial and acinar cells had no or little CB1 protein expression, while expression could be seen in small mesenchymally located cells ( Figs. 2 A, 2 C). These may be immune cells, several of which are known to express cannabinoid receptors. 27 , 28 In addition, CB1 protein has been found in neuronal axons. It has previously been reported that CB1 receptor is expressed in brain neurons and is important for neuronal function. 29 Lacrimal gland tearing is also under the control of different types of neurons that innervate the lacrimal gland. 8 Coimmunostaining with the neuronal markers, such as neurofilament H ( Fig. 3 A) and β3-tubulin ( Fig. 3 B), showed that CB1 receptor was expressed in a subset of neuronal processes. We also tested for colocalization of CB1 with markers for specific populations of neurons. The lacrimal gland is innervated by multiple neuronal inputs, including noradrenergic and substance P–positive fibers. We tested for colocalization with tyrosine hydroxylase (TH), an enzyme in the synthetic pathway for noradrenaline and so a marker for noradrenergic inputs. TH has been reported to be found near blood vessels in the lacrimal gland, 30 but we also saw TH around acini ( Fig. 3 C). Although CB1-positive processes were often closely juxtaposed to TH-positive processes, the staining did not colocalize. In Figure 3 C, the two axons closely track one another but then clearly deviate. In Supplementary Figure S1, we show another example of this close but discrete protein expression, with orthogonal projections showing that the TH-positive staining corresponds to processes running alongside the CB1-positive process(es) (Supplementary Fig. S1). Substance P–positive fibers have been reported to be sparsely distributed in interlobular connective tissue and around ducts and blood vessels in the lacrimal gland. 30 , 31 CB1 did not colocalize with substance P ( Fig. 3 D). We did, however, see coexpression of CB1 with choline acetyl transferase, a marker for cholinergic neurons ( Fig. 3 E).

CB1 receptor protein is detected in the lacrimal gland. (A) Immunohistochemical staining in murine lacrimal gland slice shows CB1 protein expression in WT tissue. (B) CB1 staining is absent in CB1 –/– tissue. Scale bars: 50 µm.

CB1 receptors are expressed in extra-acinar processes and cells. (A, B) Lacrimal CB1 protein expression (green) is seen outside acini, including small extra-acinar cell somata. Expression is not seen in green fluorescent protein (GFP)-expressing myoepithelial cells (“SMA”). (C, D) In a higher magnification image, CB1 is also visible in extra-acinar processes suggestive of neuronal axons. Scale bars: (A, B) 50 µm; (C, D) 30 µm.

CB1 is expressed on neuronal axons. (A) CB1 (green) colocalizes with axonal marker neurofilament H (NFH; red). (B) Triple stain for CB1 (green), β3-tubulin (red), and β-actin (cyan) shows colocalization with β3-tubulin. (C) Staining for CB1 (green), tyrosine hydroxylase (TH; red), and phalloidin shows closely associated but discrete TH- and CB1-positive neuronal processes. (D) CB1 (green) and substance P (red) do not colocalize. (E) CB1 (green) colocalizes with cholinergic marker choline acetyl transferase (ChAT; red).

THC Differentially Alters Basal Tear Volume in Mice in a Sex-Dependent Manner via Activation of Cannabinoid CB1 Receptors

Tearing is subject to regulation by multiple internal and external factors. Basal lacrimation is the tearing present under normal conditions, while lacrimation induced by an irritating stimulus is referred to as reflex tearing. We tested the consequence of THC treatment on basal tearing since this most closely approximates the conditions under which cannabis users would experience altered tearing. Male mice treated with THC (4 mg/kg, IP) showed a significant reduction in tear volume relative to wild-type (WT) controls ( Fig. 4 A; WT tear volume [mm on phenol red thread ± SEM]: 5.0 ± 0.7, n = 18; THC treated: 2.0 ± 0.4, n = 18; **P < 0.01, one-way ANOVA with Dunnett's post hoc versus WT control), consistent with the reduced tearing seen in cannabis-exposed human subjects. 9 Similarly, the potent CB1 receptor agonist CP55940 (0.5 mg/kg) also lowered tearing volume in WT ( Fig. 4 A; CP55940 [mm ± SEM]: 2.0 ± 0.6, n = 12; **P < 0.01, one-way ANOVA with Dunnett's post hoc versus WT control). Treatment of the male CB1 knockout mice with the CB1 receptor agonist CP55940 (Fig. 4 A; CB1 KO control [mm ± SEM]: 3.5 ± 0.5, n = 17; CP55940 in CB1 KO: 3.5 ± 0.7 n = 14) did not alter basal tearing. Notably, we found that THC application in CB1 receptor knockout mice increased tearing, suggesting that THC may have a second target besides CB1 receptors ( Fig. 4 A; THC in CB1 KO: 2.0 ± 0.4, n = 18, *P < 0.05, one-way ANOVA with Dunnett's post hoc versus CB1 KO control). This suggests that in male WT mice, the inhibitory CB1-mediated effect of tearing reduction is dominant. The CB1 receptor antagonist SR141716 (4 mg/kg) did not alter tearing in male WT mice (Fig. 4 A; SR141716 [mm ± SEM]: 5.9 ± 1.2, n = 14, NS, as above). In contrast to our findings in males, female mice treated with THC did not see a change in basal tear volume ( Fig. 4 B; WT tear volume [mm ± SEM]: 3.3 ± 0.5, n = 16; THC treated: 5.0 ± 0.5, n = 18, NS; one-way ANOVA with Dunnett’s post hoc versus WT control). However, the CB1 receptor agonist CP55940 substantially increased tearing ( Fig. 4 B; CP treated: 9.8 ± 1.1, n = 16; P < 0.005, one-way ANOVA with Dunnett's post hoc versus WT control). Treatment of the female CB1 knockout mice with the CB1 receptor agonist CP55940 (Fig. 4 B; CB1 KO control [mm ± SEM]: 5.7 ± 0.9, n = 20; CP55940 in CB1KO: 3.9 ± 0.7, n = 16, NS, one-way ANOVA with Dunnett’s post hoc versus KO control) did not alter basal tearing. As in males, the CB1 receptor antagonist did not alter tearing in females ( Fig. 4 B; SR141716 in WT females: 5.1 ± 0.7, n = 16). The results suggest that in females, activation of CB1 receptors increases tearing and that there is a pronounced sex dependence of CB1 regulation of tearing. In addition to basal and reflex tearing, lacrimation is also under the influence of sympathetic/parasympathetic regulation. Activation of the parasympathetic nervous system increases tearing via acetylcholine activation of muscarinic M3 receptors, 8 , 32 an effect that is mimicked by the muscarinic agonist pilocarpine. We tested whether CB1 receptor activation by CB1 receptor agonist CP55940 in males also reduced pilocarpine-induced tearing. As expected, subcutaneous injection of pilocarpine increased tearing, but CP55940 (0.5 mg/kg, IP) did not have any effect on pilocarpine-induced tearing ( Fig. 4 B; pilocarpine [7 mg/kg] after vehicle [mm ± SEM]: 22.2 ± 3.8, n = 10; pilocarpine after CP55940 [0.5 mg/kg]: 22.5 ± 3.6, n = 8, NS by unpaired t-test). Taken together, our results indicate that CB1 activation reduces basal tearing but not tearing induced by activation of the parasympathetic system.

See also  Monat CBD Oil

Males Express Higher Levels of CB1 mRNA and Protein Than Females

Since we observed a sex dependence of CB1 regulation of tearing, we tested whether there might be a differential expression of CB1 in males versus females. We used quantitative PCR to examine levels of CB1 in the lacrimal gland, finding that levels of CB1 message were approximately fourfold lower in females than in males ( Fig. 5 A, relative expression levels [value ± SEM, normalized to female]: females: 1.2 ± 0.3, n = 3; males: 4.9 ± 0.6, n = 4; P < 0.01 by unpaired t-test). This difference in CB1 expression may account for the sex-dependent effect of CB1 activation on tearing. In addition, we made use of Western blot for CB1 protein in lacrimal gland homogenate. Comparing levels of CB1 protein relative to whole protein, CB1 protein was found to be expressed at a higher level in males than in females ( Figs. 5 B, 5 C; CB1 expression relative to total protein [± SEM]: males: 0.05 ± 0.004, n = 4; females: 0.01 ± 0.002, n = 4; P = 0.0001 by unpaired t-test). In addition, we used RT-PCR to assess expression of CB1 mRNA in lacrimal gland and cerebellum in male mice, since cerebellum has strong expression in synaptic terminals innervating Purkinje cells 33 ( Fig. 5 D).

CB1 mRNA and protein are expressed at higher levels in male lacrimal gland. (A) Quantitative RT-PCR shows that message for CB1 receptors is approximately five times more abundant in male than in female mice. n = 3, 4, **P < 0.01 by unpaired t-test. (B) Western blot for CB1 protein shows CB1 expression in lacrimal glands of four male and four female mice. Ponceau S staining is shown in inset, bottom right. (C) Quantification of CB1 protein expression (shown in C) in males and females (CB1 protein level relative to whole protein). n = 4, ***P < 0.0001 by unpaired t-test. (D) RT-PCR shows the presence of mRNA for CB1 in lacrimal gland (LG) and cerebellum (Crb) of a male mouse, using two different probe sequences (p1, p2 in figure). Glutaraldehyde 3-phosphate dehydrogenase (GAPDH) is included as a control.

Distribution of VAMP8-Positive Vesicles Is Unaltered by Treatment With CB1 Agonist CP55940

One potential mechanism of action for CB1 is a change in the distribution of vesicles within acini. We examined whether CB1 receptor activation altered the distribution of vesicle-associated membrane protein 8 (VAMP8), a SNARE protein involved in exocytosis in acinar cells such as those found in the lacrimal gland. 34 As shown in Figure 6 A, VAMP8 showed the expected polarized distribution within acini, associated with intra-acinar ducts labeled with phalloidin, a marker for F-actin. However, there was not an appreciable difference between the VAMP8 expression patterns in lacrimal glands from untreated versus CP55940-treated (0.1 mg/kg as above) males ( Figs. 6 B, 6 C).

CB1 activation does not alter distribution of acinar vesicles in the lacrimal gland. (A) Staining for VAMP8 (green) is seen in acinar cells. Staining is polarized within acini, associated with intra-acinar ducts labeled with phalloidin (red), a marker for F-actin. (B, C) Higher magnification image of untreated lacrimal gland has similar staining pattern to that of a CP55940-treated (0.1 mg/kg, IP, 1 hour) animal. Lacrimal glands are from male mice. Scale bars: 10 µm.


Cannabis users frequently report dry eye as an undesirable side effect. To our knowledge, only one prior study has explored the relationship between cannabis and tearing: nearly 50 years ago, Hepler et al. 9 reported that cannabis reduces tearing in humans. The underpinning of this reduction has not been the subject of active study until now, despite the health burden of ADDE. In this study, we report three principal findings. First, cannabinoid CB1 receptors are present in the mouse lacrimal gland with notable expression in cholinergic axons of neurons innervating the lacrimal gland. Second, we find that THC, the chief euphoric constituent of cannabis, reduces tearing via activation of cannabinoid CB1 receptors in male mice, most likely via changing neuronal signaling. Third, the effect of CB1 activation is highly sex dependent: CB1 activation in female mice increases tearing, a difference that may arise from higher expression of CB1 in the male lacrimal gland.

The cannabinoid signaling system is complex, with multiple cannabinoid receptors, lipid messengers, and enzymes that produce and metabolize these lipid messengers. CB1 receptors are the predominant cannabinoid receptors in the central nervous system (CNS) and peripheral nervous system, 35 , 36 and it is likely that CB1 receptor–expressing lacrimal gland nerves mediate the reduction in tearing reported here. CB1 receptors are G protein–coupled receptors (GPCRs) that largely signal via Gi/o G proteins. In neurons, the CB1-mediated inhibition of calcium channels is coupled to a reduction in neurotransmitter release. 37 Inhibition of neurotransmitter release is a common theme of CB1 function in the CNS. 29 Therefore, cannabinoid CB1 receptors may regulate tearing by modulating the release of neurotransmitters. As Gi/o-coupled GPCRs, CB1 receptors also generally inhibit adenylyl cyclase, reducing cAMP levels and activate ERK signaling. 38 , 39 As noted earlier, tearing is controlled by multiple mechanisms. One major source of lacrimal regulation is the parasympathetic system: it has been established that parasympathetic activation elicits tearing 32 via muscarinic M3 receptors. 40 We showed that while CB1 is expressed in cholinergic neurons, pilocarpine-induced tearing was not reduced by CB1 receptor agonist treatment. These results are similar to what was found in the salivary gland, a related secretory structure also under neuronal control. McConnell et al. 41 showed that THC reduced salivary flow but did not impact pilocarpine- or acetylcholine-stimulated salivary flow. They did, however, find evidence for a reduction of ACh release. They concluded that THC reduced salivary flow via inhibition of ACh release. A similar CB1-dependent arrangement may be the case here.

Thus, our data indicate that CB1 activation reduces basal tearing in male mice. We have previously seen evidence of tonic CB1 activity in regulation of ocular pressure. 42 If tearing were also under partial tonic inhibition by CB1 receptors, then reversing this might result in enhanced tearing, a potentially desirable effect. However, we did not see evidence of tonic CB1 receptor activity, since the CB1 antagonist SR141716 did not increase tearing and the baseline tearing for CB1 knockouts was not different from WT controls. In female mice, however, the picture is very different. THC has no significant effect on tearing in females, but CB1 activation substantially increases tearing, the opposite of what is seen in males. We found that expression of mRNA and protein for CB1 receptors was approximately four- to fivefold higher in males than females, so it is possible that in females, the regulation of tearing occurs outside of the lacrimal gland.

Significantly, it is likely that THC acts at two targets, since THC treatment in CB1 receptor knockout mice increased tearing. THC activates not only the CB1 receptor but also other receptors, including CB2, GPR18, GPR119, and some peroxisome proliferator-activated receptor (PPARs). 43 Given the number of receptors that are engaged by THC, it is not unexpected that THC might have multiple effects on the same system via different effectors. For example, in the anterior eye, we found that THC lowered pressure by activating a combination of CB1 and GPR18 receptors. 42 In the same study, we reported that the related phytocannabinoid cannabidiol had opposing effects on ocular pressure. It will be important to determine this second target of THC; if is a receptor, then that receptor would be of considerable interest in the context of dry eye syndrome since a selective agonist for that target would be expected to enhance tearing.

Since it is likely that CB1-based cannabinoid signaling is taking place in the lacrimal gland—particularly in males—a final consideration is what other components of the cannabinoid signaling system might be active there. Of the two structurally related endogenous lipid messengers that have been identified, 2-AG and arachidonoylethanolamide (anandamide), Matsuda et al. 44 detected the presence and synthesis of the anandamide in homogenate of porcine lacrimal gland. Cannabinoid signaling in the lacrimal gland may therefore involve anandamide, but this does not rule out a potential role for 2-AG.

In summary, we find that the dry eye symptoms frequently reported by cannabis users are likely due to THC activation of cannabinoid CB1 receptors in the lacrimal gland. Future studies are necessary to elucidate a detail the mechanisms of cannabinoid signaling in the lacrimal gland.

Supplementary Material


AS was funded by a Translational Research Pilot Grant from the Johnson Center for Innovation and Translational Research and by the National Institutes of Health, National Eye Institute (grant R01 EY24625). HPM was supported by the National Institutes of Health, National Eye Institute (grants 5 R01 EY026202 and 1 R01 EY028983). Confocal microscopy was made possible by the Indiana University Light Microscopy Imaging Center (IU LMIC, Bloomington, IN).

Disclosure: A. Thayer, None; N. Murataeva, None; V. Delcroix, None; J. Wager-Miller, None; H.P. Makarenkova, None; A. Straiker, None


1. Walcott B. The lacrimal gland and its veil of tears . News Physiol Sci . 1998; 13 : 97–103. [PubMed] [Google Scholar]

2. Fairweather D, Frisancho-Kiss S, Rose NR. Sex differences in autoimmune disease from a pathological perspective . Am J Pathol . 2008; 173 : 600–609. [PMC free article] [PubMed] [Google Scholar]

3. Javadi MA, Feizi S. Dry eye syndrome . J Ophthalmic Vis Res . 2011; 6 : 192–198. [PMC free article] [PubMed] [Google Scholar]

4. Uchino M, Schaumberg DA. Dry eye disease: impact on quality of life and vision . Curr Ophthalmol Rep . 2013; 1 : 51–57. [PMC free article] [PubMed] [Google Scholar]

5. Isreb MA, Greiner JV, Korb DR, et al. Correlation of lipid layer thickness measurements with fluorescein tear film break-up time and Schirmer’s test . Eye (Lond) . 2003; 17 : 79–83. [PubMed] [Google Scholar]

6. Stern ME, Beuerman RW, Fox RI, Gao J, Mircheff AK, Pflugfelder SC. The pathology of dry eye: the interaction between the ocular surface and lacrimal glands . Cornea . 1998; 17 : 584–589. [PubMed] [Google Scholar]

7. Mathers WD. Why the eye becomes dry: a cornea and lacrimal gland feedback model . CLAO J . 2000; 26 : 159–165. [PubMed] [Google Scholar]

8. Dartt DA. Neural regulation of lacrimal gland secretory processes: relevance in dry eye diseases . Prog Retin Eye Res . 2009; 28 : 155–177. [PMC free article] [PubMed] [Google Scholar]

9. Hepler RS, Frank IM, Ungerleider JT. Pupillary constriction after marijuana smoking . Am J Ophthalmol . 1972; 74 : 1185–1190. [PubMed] [Google Scholar]

10. Matsuda LA, Lolait SJ, Brownstein MJ, Young AC, Bonner TI. Structure of a cannabinoid receptor and functional expression of the cloned cDNA . Nature . 1990; 346 : 561–564. [PubMed] [Google Scholar]

11. Munro S, Thomas KL, Abu-Shaar M. Molecular characterization of a peripheral receptor for cannabinoids . Nature . 1993; 365 : 61–65. [PubMed] [Google Scholar]

12. Sugiura T, Kondo S, Sukagawa A, et al. 2-Arachidonoylglycerol: a possible endogenous cannabinoid receptor ligand in brain . Biochem Biophys Res Commun . 1995; 215 : 89–97. [PubMed] [Google Scholar]

13. Devane WA, Hanus L, Breuer A, et al. Isolation and structure of a brain constituent that binds to the cannabinoid receptor . Science . 1992; 258 : 1946–1949. [PubMed] [Google Scholar]

14. Murataeva N, Straiker A, Mackie K. Parsing the players: 2-AG synthesis and degradation in the CNS . Br J Pharmacol . 2013; 171 : 1379–1391. [PMC free article] [PubMed] [Google Scholar]

15. Syed SK, Bui HH, Beavers LS, et al. Regulation of GPR119 receptor activity with endocannabinoid-like lipids . Am J Physiol . 2012; 303 : E1469–E1478. [PubMed] [Google Scholar]

16. Lauckner JE, Jensen JB, Chen HY, Lu HC, Hille B, Mackie K. GPR55 is a cannabinoid receptor that increases intracellular calcium and inhibits M current . Proc Natl Acad Sci USA . 2008; 105 : 2699–2704. [PMC free article] [PubMed] [Google Scholar]

17. McHugh D, Hu SS, Rimmerman N, et al. N-arachidonoyl glycine, an abundant endogenous lipid, potently drives directed cellular migration through GPR18, the putative abnormal cannabidiol receptor . BMC Neurosci . 2010; 11 : 44. [PMC free article] [PubMed] [Google Scholar]

18. Smart D, Gunthorpe MJ, Jerman JC, et al. The endogenous lipid anandamide is a full agonist at the human vanilloid receptor (hVR1) . Br J Pharmacol . 2000; 129 : 227–230. [PMC free article] [PubMed] [Google Scholar]

19. Miller S, Leishman E, Hu SS, et al. Harnessing the endocannabinoid 2-arachidonoylglycerol to lower intraocular pressure in a murine model . Invest Ophthalmol Vis Sci . 2016; 57 : 3287–3296. [PMC free article] [PubMed] [Google Scholar]

20. Miller S, Hu SS, Leishman E, et al. A GPR119 signaling system in the murine eye regulates intraocular pressure in a sex-dependent manner . Invest Ophthalmol Vis Sci . 2017; 58 : 2930–2938. [PMC free article] [PubMed] [Google Scholar]

21. Miller S, Leishman E, Oehler O, et al. Evidence for a GPR18 role in diurnal regulation of intraocular pressure . Invest Ophthalmol Vis Sci . 2016; 57 : 6419–6426. [PMC free article] [PubMed] [Google Scholar]

22. Murataeva N, Li S, Oehler O, et al. Cannabinoid-induced chemotaxis in bovine corneal epithelial cells . Invest Ophthalmol Vis Sci . 2015; 56 : 3304–3313. [PMC free article] [PubMed] [Google Scholar]

23. Murataeva N, Miller S, Dhopeshwarkar A, et al. Cannabinoid CB2R receptors are upregulated with corneal injury and regulate the course of corneal wound healing . Exp Eye Res . 2019; 182 : 74–84. [PMC free article] [PubMed] [Google Scholar]

24. Murataeva N, Daily L, Taylor X, et al. Evidence for a GPR18 role in chemotaxis, proliferation, and the course of wound closure in the cornea . Cornea . 2019; 38 : 905–913. [PMC free article] [PubMed] [Google Scholar]

25. Ledent C, Valverde O, Cossu G, et al. Unresponsiveness to cannabinoids and reduced addictive effects of opiates in CB1 receptor knockout mice . Science . 1999; 283 : 401–404. [PubMed] [Google Scholar]

26. Sain NM, Liang A, Kane SA, Urban MO. Antinociceptive effects of the non-selective cannabinoid receptor agonist CP 55,940 are absent in CB1(–/–) and not CB2(–/–) mice in models of acute and persistent pain . Neuropharmacology . 2009; 57 : 235–241. [PubMed] [Google Scholar]

27. Schatz AR, Lee M, Condie RB, Pulaski JT, Kaminski NE. Cannabinoid receptors CB1 and CB2: a characterization of expression and adenylate cyclase modulation within the immune system . Toxicol Appl Pharmacol . 1997; 142 : 278–287. [PubMed] [Google Scholar]

28. Galiegue S, Mary S, Marchand J, et al. Expression of central and peripheral cannabinoid receptors in human immune tissues and leukocyte subpopulations . Eur J Biochem . 1995; 232 : 54–61. [PubMed] [Google Scholar]

29. Kano M, Ohno-Shosaku T, Hashimotodani Y, Uchigashima M, Watanabe M. Endocannabinoid-mediated control of synaptic transmission . Physiol Rev . 2009; 89 : 309–380. [PubMed] [Google Scholar]

30. Williams RM, Singh J, Sharkey KA. Innervation and mast cells of the rat exorbital lacrimal gland: the effects of age . J Auton Nerv Syst . 1994; 47 : 95–108. [PubMed] [Google Scholar]

31. Parod RJ, Putney JW Jr. An alpha-adrenergic receptor mechanism controlling potassium permeability in the rat lacrimal gland acinar cell . J Physiol . 1978; 281 : 359–369. [PMC free article] [PubMed] [Google Scholar]

32. Mutch JR. The lacrimation reflex . Br J Ophthalmol . 1944; 28 : 317–336. [PMC free article] [PubMed] [Google Scholar]

33. Martinez LR, Black KC, Webb BT, et al. Components of endocannabinoid signaling system are expressed in the perinatal mouse cerebellum and required for its normal development . eNeuro . 2020; 7 : ENEURO.0471–19.2020. [PMC free article] [PubMed] [Google Scholar]

34. Behrendorff N, Dolai S, Hong W, Gaisano HY, Thorn P. Vesicle-associated membrane protein 8 (VAMP8) is a SNARE (soluble N-ethylmaleimide-sensitive factor attachment protein receptor) selectively required for sequential granule-to-granule fusion . J Biol Chem . 2011; 286 : 29627–29634. [PMC free article] [PubMed] [Google Scholar]

See also  Live Well CBD Gummies

35. Herkenham M, Lynn AB, Johnson MR, Melvin LS, de Costa BR, Rice KC. Characterization and localization of cannabinoid receptors in rat brain: a quantitative in vitro autoradiographic study . J Neurosci . 1991; 11 : 563–583. [PMC free article] [PubMed] [Google Scholar]

36. Spigelman I. Therapeutic targeting of peripheral cannabinoid receptors in inflammatory and neuropathic pain states . In: Kruger L, Light AR,eds. Translational Pain Research: From Mouse to Man . Boca Raton, FL: 2010: Chapter 5, Available from: https://www.ncbi.nlm.nih.gov/books/NBK57261/. [Google Scholar]

37. Mackie K, Lai Y, Westenbroek R, Mitchell R. Cannabinoids activate an inwardly rectifying potassium conductance and inhibit Q-type calcium currents in AtT20 cells transfected with rat brain cannabinoid receptor . J Neurosci . 1995; 15 : 6552–6561. [PMC free article] [PubMed] [Google Scholar]

38. Bidaut-Russell M, Devane WA, Howlett AC. Cannabinoid receptors and modulation of cyclic AMP accumulation in the rat brain . J Neurochem . 1990; 55 : 21–26. [PubMed] [Google Scholar]

39. Howlett AC, Mukhopadhyay S. Cellular signal transduction by anandamide and 2-arachidonoylglycerol . Chem Phys Lipids . 2000; 108 : 53–70. [PubMed] [Google Scholar]

40. Lemullois M, Rossignol B, Mauduit P. Immunolocalization of myoepithelial cells in isolated acini of rat exorbital lacrimal gland: cellular distribution of muscarinic receptors . Biol Cell . 1996; 86 : 175–181. [PubMed] [Google Scholar]

41. McConnell WR, Dewey WL, Harris LS, Borzelleca JF. A study of the effect of delta 9-tetrahydrocannabinol (delta 9-THC) on mammalian salivary flow . J Pharmacol Exp Ther . 1978; 206 : 567–573. [PubMed] [Google Scholar]

42. Miller S, Daily L, Leishman E, Bradshaw H, Straiker A. Delta9-tetrahydrocannabinol and cannabidiol differentially regulate intraocular pressure . Invest Ophthalmol Vis Sci . 2018; 59 : 5904–5911. [PMC free article] [PubMed] [Google Scholar]

43. Mackie K, Stella N. Cannabinoid receptors and endocannabinoids: evidence for new players . Aaps J . 2006; 8 : E298–E306. [PMC free article] [PubMed] [Google Scholar]

44. Matsuda S, Kanemitsu N, Nakamura A, et al. Metabolism of anandamide, an endogenous cannabinoid receptor ligand, in porcine ocular tissues . Exp Eye Res . 1997; 64 : 707–711. [PubMed] [Google Scholar]

Articles from Investigative Ophthalmology & Visual Science are provided here courtesy of Association for Research in Vision and Ophthalmology

CBD & the Eyes: Research & Can It Help You?

NVISION® content is medically reviewed by a licensed Ophthalmologist, Optometrist, Surgeon or Doctor. These vision experts ensure the content is fact-based and up-to-date.

We have strict sourcing guidelines and every page contains a full list of references for transparency.

CBD has become a touted treatment for various issues, including glaucoma. This is based on older medical studies and anecdotal reports that CBD oil, eye drops, and other forms of medical marijuana help to ease anxiety, eye strain, and eye pressure.

One of the first studies on medical marijuana for eye conditions involved glaucoma. This is a group of serious eye disorders associated with damage to the optic nerve, usually due to high fluid pressure in the eye, or intraocular pressure (IOP). This pressure must be lowered to prevent blindness. Further studies of medical marijuana have found that the drug does not actually lower pressure for long enough.

The United States Food and Drug Administration (FDA) has approved CBD for some very limited medical uses, and several states have legalized both medical and recreational use of marijuana, both THC and CBD.

Dispensaries recommend CBD for eye treatment, especially glaucoma. Medical research has found that medical marijuana does not lower eye pressure for more than three or four hours, which is not long enough to prevent damage to the optic nerve. Paradoxically, it may increase the risk of damage due to fluctuations in eye pressure over the course of the day.

In fact, a recent medical study found that THC, not CBD, lowered eye pressure. By itself, CBD raises IOP, and in combination with THC, it can prevent THC from lowering IOP. THC is the intoxicating, recreational chemical in marijuana, which can be addictive and cause problems with thinking or memory.

It is important for you to follow medical advice from your optometrist and ophthalmologist to manage all eye conditions, from dry eyes to glaucoma. Don’t attempt to self-treat any eye issue with CBD.

Table of Contents

Cannabidiol (CBD) & Your Eyes: High Intraocular Pressure Is Dangerous

Glaucoma is a group of related eye conditions involving damage to the retina and optic nerve that leads to vision loss, typically due to high fluid pressure inside the eyes. Symptoms tend to start slowly until enough of the optic nerve is damaged that the person develops tunnel vision or another form of lost vision. Regular eye exams can help to diagnose glaucoma or high ocular pressure, so an optometrist or ophthalmologist can monitor this progression and ensure you receive appropriate treatment if you begin to lose your sight.

Treating glaucoma starts with medicated eye drops that are designed to lower intraocular pressure. If these do not work, there are several approaches to surgery that can lower fluid pressure in the eyes and prevent vision loss.

There are side effects to all these options, so many people with glaucoma, or who are at risk for glaucoma, want to find alternatives. One proposed alternative is CBD oil, or the cannabidiol molecule derived from medical marijuana.

Using Medical Marijuana Like CBD for Your Eyes Does Not Work

As marijuana has become more popular and many states have legalized both medical and recreational uses for this drug, CBD oil is being promoted for a range of uses, including as a glaucoma treatment.

There are very few medical studies on the effectiveness of CBD or medical marijuana, although the United States Food and Drug Administration (FDA) has information on potentially beneficial uses for this approach to treatment. They have approved one CBD-based drug for two types of severe, rare epilepsy. Some forms of medical marijuana have been examined to treat eye conditions, especially glaucoma, but newer research suggests that CBD is not an effective treatment for your eyes.

Medical marijuana has been touted to generally ease physical and emotional pain, including nausea related to cancer treatment, chronic pain, general anxiety disorder, and other conditions. In the 1970s and 1980s, medical marijuana was studied as an eye treatment, particularly for serious conditions like cataracts and glaucoma, which can lead to blindness. The research found that marijuana could lower intraocular pressure for three or four hours at a time, and it was more effective at lowering pressure in the eyes than glaucoma drops.

However, the studies also found that these pressure-lowering effects would wear off after a certain amount of time, while the effects of glaucoma eye drop treatment lasted at least 12 hours. It is vital for eye health that treatment to manage intraocular pressure lasts for a long time and is consistent. When eye pressure rises and lowers several times throughout the day, damage to the optic nerve can get worse.

Medical Studies on CBD & the Eyes Suggests CBD Is a Dangerous Chemical

CBD in particular is receiving a lot of attention from the medical community and medical marijuana proponents. However, studies suggest that the CBD compound may make intraocular pressure higher, while THC (tetrahydrocannabinol), the chemical in marijuana associated with substance abuse and getting high, is responsible for lowering eye pressure.

A study conducted in 2018 found that THC and CBD regulate eye pressure differently. When they are separated from marijuana, they will have radically different effects.

The results of the 2018 study found that a single dose of THC drops lowered IOP by 28 percent for 8 hours in male mice, although humans with glaucoma need 24-hour pressure relief to reduce damage to the optic nerve. The study also found two interesting problems. First, CBD inhibited THC from lowering IOP. Second, the effects of THC on eye pressure were sex-dependent, with male mice receiving noticeably greater benefit from the treatment.

  • Accelerated heartbeat, which can trigger anxiety or feel like anxiety.
  • Decreased blood pressure overall, which can be harmful to the cardiovascular system.
  • Reduced blood flow to several parts of the body, including the optic nerve, which can increase damage.
  • Increased risk of lung cancer specifically from smoking or vaping marijuana products.
  • Greater risk of addiction with any amount of marijuana treatment containing THC.
  • Drowsiness, memory loss, and cognitive issues associated with abusing marijuana.
  • Struggles to hold down a job or drive safely if drug-tested.

Most medical research suggests that CBD does not intoxicate you the same way THC does, but taking types of medical marijuana marketed as “high CBD” might mean there are traces of THC included in the substance. THC is addictive because it can change brain chemistry to make you feel relaxed, less anxious, sleepy, or even happy. The drug can also cause negative side effects like changes in mood, spikes in anxiety or paranoia, delusions, and trouble thinking or problem-solving.

Follow Your Eye Doctor’s Treatment Plan for Treating Eye Conditions

Some dispensaries hype CBD for the eyes aside from glaucoma treatment, suggesting that it can ease pain from surgery, reduce dry eye, and even alleviate eye strain. However, there are no medical studies to back up these claims. The changes to eye pressure due to CBD may lead to damage to your vision, even if you do not have glaucoma.

The only currently approved medical approach for glaucoma is regular eye exams to monitor the condition. Follow your eye doctor’s advice to manage this condition if you are diagnosed with it. This will likely mean eye drops first to prevent vision loss. It could also mean laser eye surgery, drainage devices, or other types of surgery to alleviate intraocular pressure and reduce damage to the optic nerve.


Glaucoma. (July 2020). National Eye Institute (NEI).

Cannabidiol (CBD) – What We Know and What We Don’t. (August 2018). Harvard Health Publishing, Harvard Medical School.

Is There a Risk of Blindness With CBD? (2018). United States Food and Drug Administration (FDA).

CBD Oil May Worsen Glaucoma. (February 2019). American Academy of Ophthalmology (AAO).

What Is Marijuana? (December 2019). National Institute on Drug Abuse (NIDA).

The information provided on this page should not be used in place of information provided by a doctor or specialist. To learn more, read our Privacy Policy and Editorial Policy pages.

Related Reading

  • Foods to Avoid if You Have Glaucoma
  • Best Eye Supplements & Vitamins
  • Can Nutrition or Diet Improve Vision?
  • Beta-Carotene & Vision
  • Omega-3s & Eyesight
  • 7 Benefits of Castor Oil for Eyes & How to Use It
  • Inflammatory Bowel Syndrome & Eye Issues
  • Lutein & Zeaxanthin for Vision
  • Vitamin C & Eyesight

Every NVISION® patient is unique. To determine the best treatment for you, please complete our simple form to schedule a consultation exam.

Can Cbd Oil Help With Dry Eyes | Adam Fields

differences in time and temp making cbd oil or cbd butter in mb2e Can You Get High Off Cbd Oil, 2021-06-30 Cbd Joint can cbd oil help with dry eyes Hemp Based Cbd.

After all, he should come first if he wants to be the assistant want an authentic medical review of the use of cbd oil and its contraindications position of the cadres of the Kizuna Club Akihabara, a gyudon rice specialty store. Below the simple yellow sign is a small restaurant less than ten square meters.Rough. At this moment, she was out of breath, sweat drenched all over her body, and even the pair of can cbd oil help with dry eyes balls that had been full of energy on her head were as baffling as eggplants beaten by frost.The monk who runs away can t run the temple Taito District, Tibetan front apartment. In the dark and deep corridor, as can cbd oil help with dry eyes usual, the green emergency indicator light is cbd oil with thc in it legal in virginia 2021 flashed.The rapid cultivation technology of freeze thaw awakening makes the banana peel thinner and softer than ordinary banana peels, which can be used for direct consumption.These are quite satisfying works that he draws by can cbd oil help with dry eyes himself on weekdays. If can cbd oil help with dry eyes the senior carried him, ordinary resentful spirits couldn t get close.What The record differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops Cbd Oil For Sale can cbd oil help with dry eyes holder That name The man immediately showed excitement in his eyes.If you get a temporary test, you will die. Araki Sosuke instantly started the preaching mode.A large amount of air poured into benefits of cbd tincture his can cbd oil help with dry eyes Real Science Paper Cbd Oil lungs, gradually regaining his consciousness.Hundreds of locomotives are like can cbd oil help with dry eyes the great migration of African animals on TV, constantly whizzing past the eyes of a few people and rushing towards the best hemp top of the mountain.But for the victory of the game, he is determined to win. After all, his rx 10 uses the latest turbocharged three rotor engine technology, with two electric motors to provide power for the front axle, with a combined total output of up to 1030 horsepower.The road ahead. three years ago. At the foot of Haruna Mountain, the red can cbd oil help with dry eyes Kawasaki h2 and the black and white Warring States Samurai parked side by side on the side of the road.Let s how much is cbd oil and how much do i need stop here today. After accepting that can cbd oil help with dry eyes special attack uniform, you are the cadre of the Phoenix Please join me to protect this organization that represents the boiling soul and the speeding can cbd oil help with dry eyes life, so that it will not be affected by any rights Cannibis Oil For Sale can cbd oil help with dry eyes and money.In the larger frame, there is a happy picture of a whats the difference between cannabis oil and cbd oil man with braids proudly hugging a beautiful woman with long hair.Boom boom With a dull growl of dissatisfaction, the locomotive started listlessly under his crotch.A tough lesson Click. Sousuke Araki opened the suitcase that Big Brother Zhang slid down the tabletop.Araki Sosuke was like can cbd oil help with dry eyes a primary school student, sitting honestly in a messy room that looked like a laboratory, looking around curiously.It seemed Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e that his eyes were too sharp, and the sleeping Mai Hanyu turned over and can cbd oil help with dry eyes switched to a lying position.The displayed task completer is himself with the registered id of Kon John.She moved her shoulders high and low, moving for chronic back pain what is the mixture of thc to cbd oil towards the camera step by step.It was the virgin coconut who endured can cbd oil help with dry eyes the air of resentment and lingered in the house with the strong body of Sosuke can cbd oil help with dry eyes Araki, who was unwilling to leave can cbd oil help with dry eyes for a long time.So that s the case, has Moonkage passed away four years ago In the can cbd oil help with dry eyes Real Science Paper Cbd Oil office, the tall Siena was talking with a middle aged man with a sorrowful expression on his face.Hey, eh, with the help of two secret skills, the Hungry Ghost s Stick that Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e has been speeding up secretly, unexpectedly took this opportunity to overtake a Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e corner.I ll hold them, you go first A subordinate who was shot in the thigh yelled at him stiffly.On the top of the van, the screen of the infrared thermal imaging camera beside Li Yuncong went out.The effect of force is mutual. The greater the force that bombards him, the greater the strength of a body that is as strong as gold and iron.However, this transaction, which had been exhausted and should have been successfully received , was completely can cbd oil help with dry eyes Real Science Paper Cbd Oil reversed because of the appearance of the Blue Dragon Sabre squad out of sight.The originally rather rude words were spoken through the childish and can cbd oil help with dry eyes pleasant loli voice, but they had a hint can cbd oil help with dry eyes of coquetry.Youruo s substantial sword intent, accompanied by the whimsical sounds and pictures in the house, instantly made him almost unable to hold the things in his hands.The magazine also fell to the ground because of trembling. It turns out that the gap between me and that guy is so far away Abe Temple, who only showed off his cultivation progress to the teacher in the morning, was instantly defeated.At the moment when Mai Hanyu regretted, a man s powerful arm stretched out from behind and covered her nose and mouth with a pungent towel Black Claw To the careless Before she could struggle, Mai Hanyu s vision became blurred. Master Teak, the car is already at the entrance of the alley Good job, Songping Police Department, take her away. Be careful Haunted house appraisal On the second floor, one was abandoned because of a pair differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops of abandoned house sisters and brothers.Yamamura Sadako has an extremely rare beautiful appearance and figure, and born with the superpowers .

See also  Can You Get CBD Gummies In Australia

How good is cbd oil for carpal tunnel?

from her mother, but differences in time and temp making cbd oil or cbd butter in mb2e she is a yin and yang person suffering from the rare congenital disease Gwan Feminization Syndrome.Seeing .

Which cbd oil is best?

that the two had brought the woman out, Matsudaira threw two smoke bombs from her waist into the room and ran downstairs behind Saya Teak.The three of them made a decision, escorting Mai Hanyu out of the car, and got into the mountain trail on the side.A burning smell permeated the does cbd oil help with kidney stones cab. Hey, although my car is only a five handed car, I can t toss it like this Ignoring Ryoma s complaints before 2nd, Sosuke Araki Cbd Oil For Sale can cbd oil help with dry eyes slammed the car door and rushed out, looking around anxiously.Asshole You come back to Laozi Araki Sosuke s roar weakly echoed in the crater.Several crew members were already waiting for him in front of the boarding escalator.This allows consumers to reap all the benefits of the hemp plant without having blue moon hemp cbd to deal with the intoxicating effects of thc.This can cbd oil help with dry eyes is how you can find out whether can cbd oil help with dry eyes the cbd oil brand values their customers and their feedback on what they sell.That kind of brother. Well, seeing that you can cbd oil help with dry eyes Real Science Paper Cbd Oil actually arranged the top notch yakiniku set meal today, we will forgive you a lot Sousuke Araki, who sits next to Yuppei Higashino, nodded his head to help Asshole, I haven t said you guys, such can cbd oil help with dry eyes Real Science Paper Cbd Oil a serious Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e matter is hidden from me, Ryoma dared to save people by himself before only pulling two Kohei Higashino patted Sosuke can cbd oil help with dry eyes Araki on the back. Said dissatisfiedly. Because is there a different between cbd vape oil and cbd oil he was still in the hospital at the time, Sosuke Araki just borrowed iowa cbd oil law the alloy box from his subordinates, Cbd Oil For Sale can cbd oil help with dry eyes and did can cbd oil help with dry eyes not mention the kidnapping at all.By the way, what about that strange mask Hearing this question, Li Mingcong shook his head blankly.After that, the three flight attendants what is shelf life of cbd oil in the crew also ate in the kitchen the plane meal that could be eaten Adam Fields can cbd oil help with dry eyes by more than 20 passengers.The child s can cbd oil help with dry eyes father Seeing these things, the woman couldn should you take cbd oil at night or morning t help feeling sad can cbd oil help with dry eyes and sobbed softly.After a while, Sosuke Araki s cell phone rang Moximosi, is it Yuuji Kotori Yes, we are still stalking in Yokohama, and we haven t can cbd oil help with dry eyes found Kohei yet what, .

How long does 500ml of cbd oil last?

you how much cbd oil to treat canine lymphoma said Adam Fields can cbd oil help with dry eyes Mochizuki charlottes web cbd oil mint chocolate 100ml best price Ayano was looking for can cbd oil help with dry eyes it in private Okay, me. cbd company names If you have more information, please contact her directly Just when he just hung up the cannabis sunburn phone, Ryoma on the side rubbed his sore eyes, and suddenly called out excitedly Hey, hey, there, there is A black car drove across the bridge , Drove straight into the dock and stopped in front of the warehouse.The only person who had time to react was Ginji Matsumoto. cbd oil depression reddit He flipped canna cbd oil his wrist, holding a knife like a pen, and the trail of the knife s light flashed, blocking the golden light like a rock.At the same time, under Cannibis Oil For Sale can cbd oil help with dry eyes the surging of viscous red blood plasma, Higashino Kohei s broken neck quickly grew granulation, and took his head and body back.Hey, since you want revenge, it s up to you to see if Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e you can swallow the gift I prepared for Nuraquan.Immediately, the bullet holes in his body began to squirm and heal like a living thing.These are all people who have died from the power Adam Fields can cbd oil help with dry eyes of his starving gods and transformed into hungry ghosts over the years This voice is Araki boy Inside the platform, Siena, who was covered in blood and crumbling in the deadly cyclone , heard this familiar voice, and his eyes moved slightly.When he got close to him, the air current caused by the man s rush hit Sosuke Araki, and it instantly dissipated can cbd oil help with dry eyes Real Science Paper Cbd Oil like a breeze created by an old fan in do you feel cbd oil summer.Ginji Matsumoto raised his eyelids numbly, but responded with a sword. He Adam Fields can cbd oil help with dry eyes has no habit of chatting with weeds.Buddha s wisdom is like a sword, cutting off the worries of the world Seeing the wound on can cbd oil help with dry eyes his chest, it slowly healed halfway and stopped moving.Compared with the optimistic and sunny girl in front of where to buy cbd oil without thc in little rock arkansas her, she looked so small.She was combing her playful watermelon head, her small face was fleshy, and can cbd oil help with dry eyes she looked up at Sosuke cbd vape oil cartridge near me Araki curiously with her innocent and big eyes.So, the license plate registrant Natsume Juto, who was secretly can i sell cbd oil on ebay investigated by Tamiya kun before, only admitted to the crime of illegal modification of a motor vehicle , and denied all other charges, right Yes, the target is only one person. The bad high school students and their psychological defenses are quite can cbd oil help with dry eyes weak, and they explained all the illegal activities in the weekdays.After Cbd Oil For Sale can cbd oil help with dry eyes hesitating, she took out the can cbd oil help with dry eyes phone and dialed a certain number. Rather than having can cbd oil help with dry eyes a lot of thoughts will i test positive for cannabis if use cbd oil here, it s better to ask a person to come over to inquire and confirm it in person.After nearly a thousand years, Japan has yet to have another person who has entered the world.In other words, Mr. Kohei, Miss Reiko, and Dean Haruto, should also like to see Mr.The old man sat solemnly and solemnly like a believer waiting for baptism, watching her movements with satisfaction Wipe away the darkness in front of you. The huge spiritual power floated gently on the old man with the talisman differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops paper A good how long does pure cbd oil stay in your system charm. The old man can cbd oil help with dry eyes closed his eyes Cbd Oil For Sale can cbd oil help with dry eyes with a smile, his hands slowly folded in front of him, wrapped where to buy cbd oil in bolivar missouri in that spiritual power.At this moment, the spreading black air was less than one kilometer away from them.Thanks can cbd oil help with dry eyes to the discovery how long does hemp thc from cbd oil stay in your system of the clues in Lesson 9 and the advance evacuation work, coupled with the baptism of various natural disasters such as earthquakes, tsunamis, typhoons, nuclear radiation, volcanic eruptions and so on over the years, as well differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops as a large amount of disaster prevention education that has been deeply rooted in the hearts of the can cbd oil help with dry eyes people at this moment.So, within this level of can cbd oil help with dry eyes resentment, can the wraith spirit be observed only with the naked eye The one who shot the rear was the ninth class agent who was with him and wearing spirit detective glasses.In the area where the black air dissipated, cbd oils for pain relief differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops the lights on both sides of the road can cbd oil help with dry eyes flickered slightly, and the city began to Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e gradually return to the bright lights of the past.The Kyoto court granted titles to Chongde, built shrines, and offered Buddhist scriptures, but the disaster never ceased.I am Adam Fields can cbd oil help with dry eyes lucky enough to be reborn in such a prominent differences in time and temp making cbd oil or cbd butter in mb2e Cbd Pure Oil Drops family I am not worthy of your expectations at all It is not worthy of you No, master I know, smart organics advanced cbd oil with terpenes I always know What, since you know why do you need Hearing Uncle Keigo s words, Fujiwara Takumi s face turned pale and looked crazy.Meiji How could it be possible Feeling the substantive superior power in the opponent s body, Chongdeokin suddenly felt like a big enemy, and the whole body s resentment rose into the sky like a pillar of fire.I don t know when I ve heard of one Instead, he eagerly moved to the back of Sosuke Araki, posing various poses full of power, as if he was showing a muscular bodybuilder to the judges.It is more similar to funeral and blessing ceremonies for the dead. In this large scale sacrifice in front of her, she only needs to do what she can do.She points out, however, that severe pain, such as the pain associated with fibromyalgia, endometriosis, or musculoskeletal pain such as severe back pain, benefits from the can cbd oil help with dry eyes entourage effect of cbd in conjunction with thc.Even at his current speed, facing such an existence, I am afraid there is no way to Adam Fields can cbd oil help with dry eyes .

Who wrote prime video cbd hemp oil season 1?

am i allowed to take cbd oil on the plane to australia escape.Two huge golden can cbd oil help with dry eyes beams of light spread out from her where to buy cbd oil in odessa tx eyes, erupting towards the night sky from the rooftop of the apartment in front of the Tibetan.Hehe, the smelly Taoist priest is also here. It seems that the people who sealed me at the beginning, except for the corpse, are all here The original immature voice had a strong killing intent. Unexpectedly, I wanted to use Mochizuki s celestial blood to seal my soul, but instead allowed me to get the body Adam Fields can cbd oil help with dry eyes of the Moon Wheel Nine Lights that I have never seen in hundreds of years In the girl s eyes, there were eight surrounding her Adam Fields can cbd oil help with dry eyes dark pupils. The small black round pupils were spinning like a revolving lantern.Yes, it was a cruelly laughing girl can cbd oil help with dry eyes with golden eyes. At this moment, a hundred eyes opened, dazzling.Hundred eyed ghosts are unsolvable monsters that take more eyes and are more capable Tokimoto Ichiro and Kobe, who were given a respite by the explosion of Mochizuki Ayano , did not show any expressions of rejoicing.Enable me Cbd Oil For Sale can cbd oil help with dry eyes to use this can u use cbd oil and go to a pain clinic for opiates grievance, Your Excellency how do you know if cbd oil is suited for sublingual administration is also honorable despite death.It is mounted by the bomber to the enemy ship and thrown out, without any hope of returning.In addition to the words that threaten can cbd oil help with dry eyes Real Science Paper Cbd Oil figures , study materials , motorcycles and other things like this guy s beloved, mentions Yuhei Higashino , Reiko , Ryoma before what will last longer for a day liquid or pill cbd oil pills Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e Nikkei , and Toriyuki Mayumi Waiting for the names of people he is familiar with will also make this guy react, temporarily breaking through that seal.Obviously, it doesn t matter anymore. Time flies, and things can cbd oil help with dry eyes are different.Warring States Samurai Seeing that the detective Provide The Best differences in time and temp making cbd oil or cbd butter in mb2e was Cannibis Oil For Sale can cbd oil help with dry eyes saved, Abeji breathed a sigh of relief and greeted the double swords in the air to can cbd oil help with dry eyes scabbard themselves.It was also at that time, can cbd oil help with dry eyes High Cbd Oil Organic Extract Redefined Yaodao Qiyueyu, never knowing where, returned to her waist.It is one of the three mountains in Kanto. It Cannibis Oil For Sale can cbd oil help with dry eyes is famous for its disaster elimination and is said to be the top three in the number of Hatsumi in the New Year in Japan.From the day he returned, the world in his left eyes was covered with a layer of what are the side effects of cbd dark red blood and can cbd oil help with dry eyes filth.For Sosuke Araki, it s like watching a harmonious and can cbd oil help with dry eyes beautiful pure love movie for more than two decades, and suddenly being magically changed into a horror movie.With the can cbd oil help with dry eyes end of the Warring States period, the monks and soldiers completely disappeared from Japanese history.But that guy is not ordinary best cbd oil stocks and difficult, so be can cbd oil help with dry eyes careful Cut, who is afraid of anyone The guy who complains about trouble is often alone.Each 2 oz 60ml container of pain relief body balm has about 600 can cbd oil help with dry eyes Real Science Paper Cbd Oil mg of cbd, along with other phytocannabinoids such as cbda, cbc, cbn, cbg, and just can cbd oil help with dry eyes a small amount of thc less than the.This is why it is best to work with a medical professional specializing in cbd treatment to optimize your dosing schedule.Make sure to check Cannibis Oil For Sale can cbd oil help with dry eyes your state s cbd laws, as it is illegal in some states, or you may require a medical card.Unlike thc, which binds directly to cb 1 receptors located in the brain, cbd works in the body by manipulating receptors throughout organ tissues, the immune system, the pain response system, the hormonal system, and other whole body regulatory systems.This is why it has been capable of treating conditions such as depression and anxiety, as well as chronic physical ailments such as pain, inflammation, arthritis, and more.

How useful was this post?

Click on a star to rate it!

Average rating 3 / 5. Vote count: 1

No votes so far! Be the first to rate this post.