Cannabidiol for Viral Diseases: Hype or Hope?
1 Center for Research in Medical Pharmacology, University of Insubria, Varese, Italy.
2 Emmac Life Sciences, London, United Kingdom.
2 Emmac Life Sciences, London, United Kingdom.
3 Department of Surgery and Cancer, Imperial College London, London, United Kingdom.
1 Center for Research in Medical Pharmacology, University of Insubria, Varese, Italy.
1 Center for Research in Medical Pharmacology, University of Insubria, Varese, Italy.
* Address correspondence to: Marco Cosentino, MD, PhD, Center for Research in Medical Pharmacology, University of Insubria, Via Monte Generoso 71, Varese, 21100, Italy, [email protected]
Background: The possibility of cannabidiol (CBD) to be used as an antiviral or to treat viral diseases has received limited attention so far, despite the growing number of claims that CBD could be used for the treatment of viral infection-related conditions.
Aim and Methods: Therefore, we systematically retrieved and critically evaluated the scientific literature available on PubMed and the claims on the Internet, to assess the current state of knowledge on the use of CBD in viral diseases, and to provide suggestions for future research directions.
Results: PubMed search referenced two original articles supporting the use of CBD for the treatment of hepatitis C and Kaposi sarcoma and one article reporting the ability of CBD to reduce neuroinflammation in a virus-induced animal model of multiple sclerosis. Internet search found 25 websites claiming more indications for CBD. Remarkably, those claims were provided mostly by commercial websites and were not supported by appropriate scientific references.
Conclusion: Although preclinical studies suggest the potential effectiveness of CBD in viral diseases such as hepatitis C and Kaposi sarcoma, clinical evidence is still lacking. Anecdotal experiences of CBD use retrieved on the Internet, on the other side, lack any support from sound scientific evidence, although they might in some cases provide suggestions for conditions associated with viral infections that may deserve proper assessment in well-designed clinical trials.
Cannabis (Cannabis sativa L., fam. Cannabaceae) and its derivatives are currently credited with treating a variety of medical conditions, including pain in adults, chemotherapy-induced nausea and vomiting, and spasticity associated with multiple sclerosis (MS). 1 Many medical applications of cannabis and cannabinoids are related to their anti-inflammatory activity, which is, however, a double-edged sword under certain conditions. Particularly in viral infections, the anti-inflammatory activity of Δ 9 -tetrahydrocannabinol (Δ 9 -THC), 2 the main component of cannabis, may jeopardize host immune responses to acute viral infections, leading to disease progression and death in the worst case. 3,4 Nonetheless, Δ 9 -THC may be beneficial in viral infections where the host inflammatory response is pathogenic, 3 although its psychoactive and addictive potential is a significant limitation to its therapeutic development.
Cannabidiol (CBD) is one of the main cannabinoids found in the cannabis plant that, unlike Δ 9 -THC, is devoid of psychotropic effects and addictive potential. 5 Long neglected, CBD is currently gaining traction as a therapeutic vector for a vast range of pathological conditions. 6 Recently, Epidiolex ® , a CBD-only drug, has been approved by Food and Drug Administration (FDA) to treat seizures in children with intractable forms of epilepsy. 7 Since then, researchers have begun to search for more therapeutic applications for CBD.
Fragmentary evidence points to a possible use of CBD in viral infections. Indeed, several plant-derived compounds do have proven antiviral activity across a broad array of different chemical groups and structures. 8,9 The main point is that plant secondary metabolites have evolved to become antimicrobial, and this includes many phenol-based compounds, such as those with terpenoid moieties. 10 Despite the lack of research specifically on phytocannabinoids, there is a lot of scientific data on terpenoids. 9,10 There is also a lot on the known targets of CBD, for instance, around its ability to induce apoptosis in mammalian cells. 11 Apoptosis is well known to be a critical component of host responses to viral infections. 12 On the basis of this background, we critically reviewed the scientific literature to examine the current state of knowledge on the use of CBD in viral infections, and to provide suggestions for future research directions and perspectives. Since CBD-based products are popular and easily available to the general public, 13 and the Internet is increasingly used as a source of health-related information, 14 we also consulted the Internet for anecdotal evidence or claims that CBD is being used or reported as an antiviral or in general as an aid in viral diseases.
This systematic review follows the guidelines validated by PRISMA, the Preferred Reporting Items for Systematic Reviews and Meta-analyses.
Systematic review of the scientific literature
PubMed was searched to retrieve any relevant studies supporting the antiviral activity of CBD. Searches were conducted in March 2019 without restriction of language or years. Search algorithm was obtained by combining terms related to “cannabidiol” with those related to “viral infections” or “virus” as shown in Table 1 . References identified through this process were subsequently scanned for selection criteria. Inclusion criteria included studies of the antiviral activity of pure CBD. Excluded topics included review articles, duplicates, and studies of synthetic analogs, enriched extracts, or metabolites of CBD. Thereafter, reference lists of the included articles were screened for additional reports.
Search Algorithm for PubMed Screening
|CBD (https://www.ncbi.nlm.nih.gov/mesh/?term=cannabidiol)||Virus (https://www.ncbi.nlm.nih.gov/mesh/?term=virus)|
|Viral infections (https://www.ncbi.nlm.nih.gov/mesh/?term=viral+infections)|
|Cannabidiol-3-monomethyl ether||Viral infections|
|6″-azidohex-2″-yne-cannabidiol||Influenza A virus|
|4-(3-3,4-p-menthadien-(1,8)-yl)olivetol||Respiratory syncytial virus|
|Cannabidiol hydroxyquinone||Hepatitis A virus|
|Cannabidiol dimethyl ether||HBV|
|Influenza B virus|
|Influenza A virus|
CBD, cannabidiol; HBV, hepatitis B virus; HCV, hepatitis C virus; HSV, herpes simplex virus.
During May 2019, we searched DuckDuckGo without restriction of language and years for anecdotal evidence or signals that CBD is being used or reported as antiviral, using the “cannabidiol virus” search string. Thereafter, supporting references retrieved from the included websites were screened for additional records. The choice of DDG as search engine, among others, was dictated by the goal of ensuring the reproducibility of our search results, as strongly recommended elsewhere. 15 DDG distinguishes itself from other search engines by not profiling its users and by showing all users the same search results for a given search term.
Systematic review of the scientific literature
Full details of the search strategy are summarized in Figure 1 . PubMed referenced 77 articles, only 3 of which were relevant to this review ( Table 2 ). The complete list of articles retrieved along with reasons for exclusion is presented as Supplementary Table S1.
Strategy for PubMed search.
Summary of the Effects of Cannabidiol in Viral Infections
|Experimental model||Methods||Effects||Positive controls||Mechanism||References|
|HepG2 2.2.15 cells||Real-time quantitative TaqMan PCR assay||No effect on HBV replication||Lamivudine||N/A||Lowe et al. 16|
|MTS based assay||Significant cytotoxicity at 10 μM for 6 days||N/A||Lowe et al. 16|
|Huh7.5 cells||Renilla Luciferase Assay System||Significant inhibition of HCV replication in a concentration-dependent manner||IFN-α and sofosbuvir||N/A||Lowe et al. 16|
|CytoTox-1 reagent||Slight cytotoxicity at 10 μM for 72 h||N/A||Lowe et al. 16|
Kaposi sarcoma tissue samples
|Fluorescence||No effect on the modulation of the infection||N/A||N/A||Maor et al. 17|
|MTS based assay||Inhibition of the proliferation||N/A||N/A||Maor et al. 17|
|TUNEL method||Induction of apoptosis||N/A||N/A||Maor et al. 17|
|Prevention of the transformation of normal cells to KSHV-associated cancers||N/A||Inhibited expression of vGPCR in cutaneous Kaposi sarcoma lesions;
Decreased GRO-α and IL-8;
Decreased VEGF-C, VEGF-D, and VEGFR-3
|Maor et al. 17|
|TMEV-induced demyelinating disease-susceptible female SJL/J mice;
Murine brain endothelial cells (b.end5);
Rat astrocytes prepared from postnatal Wistar pups;
Nervous tissue (prefrontal cortex and spinal cords) or from cell cultures using RNeasy mini columns
|Activity cage coupled to a Digiscan Analyzer||Amelioration of motor deficits||N/A||Decreased microglial activation and production of the proinflammatory cytokine IL-1β;
Decreased TNFα and IL-1β mRNA induction in the spinal cord
|Mecha et al. 18|
|Microscopy||Decrease of leukocyte infiltration in the brains||N/A||Reduced leukocyte adhesion to endothelial cells;
Inhibition of VCAM-1 production;
Reduction of CCL2, CCL5, and CCR2 mRNA induction in the prefrontal cortex;
Activation of adenosine A2A receptors
|Mecha et al. 18|
CCL, C-C chemokine ligand; CCR2, C-C chemokine receptor type 2; ELISA, enzyme-linked immunosorbent assay; GRO-α, chemokine growth-regulated protein α; IFN-α, interferon alpha; IL, interleukin; KSHV, Kaposi’s sarcoma-associated herpesvirus; mRNA, messenger RNA; MTS, 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium; N/A, not available; TMEV, Theiler’s murine encephalomyelitis virus; TNFα, tumor necrosis factor alpha; TUNEL, terminal deoxynucleotidyl transferase dUTP nick end labeling; VCAM-1, vascular cell adhesion protein 1; VEGF, vascular endothelial growth factor; vGPCR, viral G protein-coupled receptor.
The most recent article reports an in vitro study suggesting a direct antiviral effect of CBD against hepatitis C virus (HCV), but not against hepatitis B virus (HBV). 16 Researchers cultured HepG2 2.2.15 or Huh7.5 cell lines to generate HBV and HCV, respectively. After days of culture in the presence of up to 10 μM CBD, CBD concentration-dependently inhibited HCV replication by up to 86.4% (EC50=3.163 μM). The HCV inhibitory effect of CBD at 10 μM was comparable to that of interferon alpha (IFN-α) 10 IU/mL, used as a positive control. Remarkably, CBD 10 μM was less cytotoxic than IFN-α 10 IU/mL. On the other hand, comparison with sofosbuvir using the same experimental model showed less efficacy and more cytotoxicity.
The other study shows an indirect antiviral action of CBD against Kaposi’s sarcoma-associated herpesvirus (KSHV) using a model of KSHV-infected human dermal microvascular endothelial cells (HMVECs). 17 HMVECs were pretreated with various concentrations of CBD, followed by infection with KSHV. After 48 h of culture, results showed that CBD up to 10 μM did not affect the efficiency with which KSHV infected HMVECs, but it reduced KSHV-infected cells proliferation (IC50=2.08 μM) and enhanced apoptosis (EC50=1.04 μM). In addition, CBD treatment was able to prevent the transformation of normal cells into KSHV-associated cancers. The observed effects of CBD occurred through inhibition of the expression of KSHV viral G protein-coupled receptor, chemokine growth-regulated protein α, vascular endothelial growth factor receptor 3, and vascular endothelial growth factor C.
The last article supports the use of CBD to reverse the deleterious effects of neuroinflammation induced by Theiler’s murine encephalomyelitis virus (TMEV). 18 Using the model of TMEV-induced demyelination in mice, Mecha et al. 18 showed that subchronic treatment with CBD (5 mg/kg) decreased leukocyte infiltration and microglia activation in the brain of TMEV-infected mice, improving motor symptomatology and the neuroinflammation in the chronic phase of infection. Interestingly, when administered for 10 days to mice immediately after infection with TMEV, CBD exerted long-lasting effects on the onset of symptoms, impairing the chronic phase of the disease, restoring motor function and reversing neuroinflammation. The study does not provide any experimental evidence of direct or indirect antiviral effect of CBD. The observed anti-inflammatory effects of CBD involved, at least in part, the activation of adenosine A2A receptors.
Full details of the search strategy are summarized in Figure 2 . In total, 179 references were identified, 24 of which were deemed potentially relevant to this review based on the screening of their content ( Table 3 ). One reference was added after the screening of supporting references of the included websites. The complete list of the websites retrieved along with reasons for exclusion is provided as Supplementary Table S2. Excluded records were websites linked to the articles already retrieved on PubMed, website pages that did not report claims on antiviral effects of CBD, duplicate references, and nonfunctional website pages.
Strategy for Internet search. DDG, DuckDuckGo.
Included Records After Internet Search
|URL||Website characteristic||Virus or viral infections||Claims||Dosage forms||Sources reported in the website page|
|https://buymedicalcannabidiol.com/cannabidiol-oil-herpes-cbd||Commercial website||HSV||CBD is useful against HSV||N/A||N/A|
|https://cannabidiol360.com/cbd-for-hiv||Commercial website||HIV||CBD is useful for HIV symptoms management||Suppositories, pills, capsules, oil and tinctures||N/A|
|https://cannabidiol360.com/cbd-for-herpes-how-to-control-your-symptoms||Commercial website||HSV||Ability to fend off and/or disable the herpes virus||Cream, balm, tincture, vaping, dabbing, CBD honey, and lip balm||N/A|
|https://cannabidiolcoldsocan.com||Education platform||Cold sores||CBD can help in boosting the individuals’ immune system;
CBD promotes healthy cells and treats inflammation
|https://cannabidiolherpes.com||Education platform||Herpes||CBD can help in the treatment of symptoms of herpes because of its antiviral and anti-inflammatory properties||N/A||N/A|
|https://cannabismd.com/health/std/how-cbd-and-hsv-interact-the-antiviral-properties-of-cannabidiol||Education platform||Herpes||CBD cannot cure herpes but relieves pain and helps with the outbreaks. CBD can fight against virus||N/A||N/A|
|https://cannabismd.com/health/std/genital-herpes-vs-cold-sores-can-cannabidiol-help||Education platform||Genital herpes and cold sores||According to patients, CBD reduces their pain and discomfort significantly||Topical lotions, oil tinctures, edibles, and vapes||N/A|
|https://cbdamericanshaman.com/blog/nasal-congestion-can-cbd-oil-get-rid-of-it||Commercial website||Rhinovirus||CBD does not help to get rid of the blocked-up air passages. CBD can help fight the virus||Oil||N/A|
|https://cbdamericanscbdam.com/blog/cbd-oil-battle-common-Cold||Commercial website||Colds||CBD can help fight the virus||N/A||N/A|
|https://cbdinstead.com/blogs/cbd-and-skin-health/can-cbd-help-with-shingles||Commercial website||Shingles||CBD can’t cure shingles, but it may be able to help with some of the symptoms that arise including pain||CBD hemp oil||http://doi.org/10.4103/0974-8490.199780|
|https://cbdinstead.com/blogs/cbd-for-general-health/cbd-for-the-common-cold||Commercial website||“cold virus”||CBD can help reduce the inflammation, granting relief from the pressure and sinus drips. CBD can help with the irritation in your throat, helping to prevent a dry cough that is so common at the end of a cold. CBD reduces the sensitivity to pain through its indirect interaction with the cannabinoid receptor CB1. CBD reduces the overactivity of the immune system||CBD bath salts in warm water or CBD pills||N/A|
|https://drsircus.com/medical-marijuana/diminishing-suffering-colds-flu-medical-marijuana||Blog||Colds and flu||CBD may offer control of the immune system and in turn provide protection from viral infections||N/A||N/A|
|https://marijuanastocks.com/cbd-oil-could-be-the-cure-for-hepatitis-c/||Commercial websites||HCV||CBD stops the replication of HCV by 86.4%||N/A||http://doi.org/10.4103/0974-8490.199780|
|https://mmjintheusa.com/category/medical-marijuana-research/cannabidiol||Education platform||HCV||CBD inhibited HCV replication by 86%||N/A||http://doi.org/10.4410/0974-8490.199780|
|https://outcoca.blogspot.com/2014/08/the-benefits-of-cannabidiol-cbd.html||Blog posted on Friday, August 8, 2014||MRSA virus||CBD applied topically has been shown to stop the MRSA virus||N/A||http://preventdisease.com/news/13/050313_There-Is-No-Mistaking-The-Evidence-Cannabis-Cures-Cancer.shtml|
|https://purehempoilforpain.com/hemp.cannabidiol.oil.natural.en.espanol=bd2082.html||Commercial website||Genital herpes virus||CBD is useful against genital herpes virus||N/A||N/A|
|https://www.dinafem.org/en/blog/marijuana-ebola||Blog||HIV and Ebola||CBD can control the human immune system and provide protection against viral infections like HIV and Ebola||N/A||http://cannabisdigest.ca/cbd-protective-ebola-virus|
|https://www.easybodyfit.com/cbd-oil-for-pain||Commercial website||Not identified||Various studies have found that CBD kills virus||N/A||N/A|
|https://www.globenewswire.com/news-release/2017/04/18/961774/0/en/Luminar-Media-Group-Inc-Testing-to-Begin-on-TherOZap-Working-Prototype-Topical-Cannabidiol-Oil-against-the-Zika-and-West-Nile-Viruses.html||Media||Zika and West Nile viruses||Luminar Media Group, Inc. and The Jenex Corporation report that testing of a topical CBD oil from hemp utilizing the TherOZap™ device is being initiated to determine the effectiveness at inactivating both the Zika and West Nile viruses||N/A||N/A|
|https://www.greenmedinfo.com/article/cbd-has-pharmacological-effects-may-significantly-improve-mental-and-somatic-h||Education platform||Ebola||CBD, based on its pharmacological effects and favorable safety profile, should be considered as a treatment for individuals with post Ebola sequelae||N/A||http://doi.org/10.1101/j.ijid.2016.09.020|
|https://www.linkedin.com/pulse/cannabidiol-case-report-bells-palsy-philip-w-blair-m-d-||LinkedIn posted of Philip W. Blair, senior medical director at Elixinol||Shingles and HCV||CBD also has antiviral properties that have been shown specifically against HCV. CBD could be highly effective in shingles.||N/A||http://doi.org/10.4103/0974-8490.199780|
|https://www.marijuanabreak.com/cbd-for-herpes||Education platform||Oral and genital herpes||CBD is used to combat both the inflammation and the immune response induced by active HSV outbreaks. CBD has been shown to display excellent antiviral properties||Infused topical CBD creams and ointments (oil tinctures) and blisters||http://chefderekbuch.blogspot.com/2201/10/cannabis-is-more-effective-as-antiviral.htmlhttp://doi.org/10.1186/1741-7015-2-34http://doi.org/10.1002/jmv.24292http://doi.org/10.1111/1348-0421.12477http://doi.org/10.1097/MCO.0000000000000027|
|https://www.purecbdselection.com/blog/medical-conditions/cbd-oil-for-epstein-barr-virus||Commercial website||Epstein–Barr virus||CBD is useful against Epstein–Barr virus||N/A||N/A|
|https://www.quora.com/Does-CBD-help-with-shingles||Discussion forum||Shingles||CBD boasts considerable anti-inflammatory qualities. CBD also protects nerve cells from further damage from the shingles virus, and from future attacks.||N/A||N/A|
|http://cannabisdigest.ca/cbd-protective-ebola-virus||Education platform||Ebola||There is good scientific evidence that cannabinoids, and in particular CBD may offer control of the immune system and in turn provide protection from viral infections. Cannabinoids inhibit VEGF and inhibit Glioma brain tumors growth by this mechanism. (6) It is reasonable to predict that inhibition of VEGF and other cytokines by cannabinoids during an Ebola infection will help the survival of this deadly disease||N/A||N/A|
Websites are listed in the order provided by the search engine.
MRSA, methicillin-resistant Staphylococcus aureus.
Most of the selected websites claim benefits of using CBD for the treatment of several viral diseases, including oral and genital herpes (n=8), shingles (n=3), hepatitis C (n=3), colds and flu (n=3), HIV/AIDS (n=2), Ebola (n=2), and infectious mononucleosis (n=1). Those claims were provided by commercial websites (n=11), education platform (n=8), online media (n=1), and LinkedIn (n=1). In most cases, however, the reported benefits of CBD for viral infections were not supported by appropriate scientific references.
Other references reviewed were blogs (n=3) or discussion forum (n=1), where users could share and compare their views, beliefs, and experiences of CBD use in viral infections. Remarkably, in a discussion forum, * many claims were made about the benefits of CBD in the treatment of shingles. Reported comments of users include the following: “CBD boasts considerable anti-inflammatory qualities. CBD also protects nerve cells from further damage from the shingles virus, and from future attacks. CBD will not cure shingles but can help with pain” posted by Elle Hayes on November 14, 2017; “Without a doubt CBD oil is the only thing that actually helped and shortened the life span of my shingles outbreak” posted by Cat Lennon on February 18, 2019; “CBD can help relieve the symptoms of pain caused by shingles as well as reduce inflammation and protect nerve cells” posted by Jules S. on September 26, 2018; “CBD may help” posted by Katy Did, on December 27, 2017; “Quality CBD capsules or oil can provide effective relief for shingles. It can help with the nerve pain and inflammation. A quality CBD balm can also help with skin pain” posted by Mark Mallen, on January 30, 2018; “CBD has shown in studies that it may be able to help reduce your sensitivity to pain. Putting a CBD hemp oil topical on your shingles may be able to help decrease the inflammation which is another way that CBD can help with the pain” posted by Selim Reza on December 28, 2018.
The alleged benefits of CBD for the treatment of viral infections were most often explained by its well-known anti-inflammatory and analgesic effects rather than a direct antiviral activity. Particularly in Ebola, the alleged benefits of CBD were backed by its pharmacological properties, which according to Reznik et al., could improve the mental and somatic health of patients suffering from post-Ebola sequelae. 19
Various dosage forms of CBD have been reported, including mainly ointments, creams, and pills. Interestingly, one reference announced that a study of hemp-based topical CBD oil using the TherOZap™ device was underway to determine the efficacy of CBD in inactivating Zika and West Nile viruses. 20
This systematic review sought to examine the current state of knowledge on the use of CBD in viral diseases. We first searched for scientific literature and found very little references to the antiviral effects of CBD. Then, we turned to the Internet and retrieved additional and rare instances of benefits of CBD in the treatment of viral infections.
PubMed search shows that currently available scientific literature provides only circumstantial evidence that CBD has a direct effect on HCV replication and indirect antiviral action against KSHV infection. 16,17 Together, these findings suggest that CBD may be a novel targeted candidate for the treatment of hepatitis C and Kaposi sarcoma. This is to be welcomed as these pathological conditions affect millions of people globally and offer limited therapeutic options to patients so far. 21,22 Importantly, the observed in vitro effects of CBD occur at concentrations achieved in humans with well-tolerated therapeutic doses of Epidiolex (up to 20 mg per kg of body weight per day), 23 suggesting that these findings might be easily translated into clinics. However, there is evidence that, other cannabinoids such as Δ 9 -THC may instead enhance infection and replication of KSHV and promote KSHV-induced endothelial transformation. 24
In addition to its antiviral activity on HCV and KSHV, CBD was found to reverse the deleterious effects of neuroinflammation in TMEV-infected mice. 18 Indeed, following intracranial inoculation of TMEV, susceptible mouse strains developed a chronic demyelinating disease similar to MS. 25 This study actually does not provide any evidence for a direct antiviral effect of CBD, nonetheless it suggests the ability of CBD to affect the neuroinflammatory events underlying the pathogenesis of MS. Although MS cannot by any means be considered a viral disease, several lines of evidence suggest the contribution of some human viruses in its etiology and pathogenesis. 26 Cannabinoids, including CBD, are currently used to treat symptoms of pain and spasticity in MS, 27 and recently, they are gaining increasing interest for their immunomodulating properties that might affect the immunoinflammatory mechanisms underlying MS pathogenesis and progression. 28 Available evidence thus strongly warrants preclinical and clinical studies aimed at establishing the potential of CBD as an immunomodulating agent in MS, considering its effects on the immune system and on other factors contributing to MS, possibly including viral infections.
Searching the Internet for claims about conventional as well as alternative therapeutics is nowadays of paramount importance, in view of the extensive and continuously increasing use of the Internet by common people to retrieve health-related information. 14 Our DDG search on the Internet found more indications for CBD, including in the treatment of oral and genital herpes, HIV/AIDS, cold and flu, shingles, hepatitis C, Ebola, mononucleosis, progressive multifocal leukoencephalopathy, and West Nile and Zika fevers. Reportedly, the antiviral potential of CBD lies in the fact that it may affect both the innate and adaptive immune cells functions 29,30 and host inflammatory responses play a critical role in the pathogenesis of these viral diseases. However, apart from hepatitis C, there is a very real lack of scientific evidence supporting the other alleged antiviral properties of CBD.
Claims about the benefits of using CBD in viral infections were largely reported by CBD online retailers and most often appear to be a biased interpretation of the scientific literature or a dishonest manipulation of the information for commercial purposes. For instances, the purported benefits of CBD use in hepatitis C appear to be extrapolated from a single in vitro study in which CBD showed to inhibit HCV replication. 16 Overall, this situation comes to be problematic when desperate patients, because of the limited therapeutic options they have for their condition, are embracing very enthusiastically these claims. Indeed, misleading claim raises significant public health concerns, as it may keep some patients from accessing appropriate, well-established antiviral therapies or looking out for possible risks associated with CBD use. 31 In addition, since CBD-based products are generally easier to obtain over the counter by the general public, physicians may be confronted with the effects of CBD—and thus the possibility of unwanted interactions with standard therapies—even when they do not prescribe it themselves.
On the other side, however, claims about the use of CBD in oral and genital herpes, shingles, and Ebola are plausible on the basis of the anti-inflammatory and analgesic properties of CBD 32 and therefore deserve proper attention by the scientific community. For instance, in Ebola, CBD has been proposed to improve the mental and somatic health of patients suffering from post-Ebola sequelae. 19 In addition, ameliorating inflammation, which is common in these conditions, 33–35 could be beneficial for patients. Likewise, the anecdotal claims retrieved in an online forum concerning the symptomatic benefits of CBD in shingles-associated inflammation and pain, despite being based just on the personal experience of one subject, suggest the opportunity to consider testing CBD in clinical trials as an add-on therapeutic for shingles-related distress.
Although preliminary results achieved so far are encouraging, much remains to be done before CBD reaches the marketplace as a treatment for viral diseases. Currently, there is no evidence from properly designed clinical trials to support the use of CBD for the treatment of hepatitis C and Kaposi sarcoma. Only well-powered double-blind randomized, controlled clinical trials on the efficacy of pure CBD are useful to recommend CBD as a help for patients with viral infections. In addition, current evidence supporting the use of CBD in virally induced pathological conditions is confined to only two in vitro and one in vivo studies, which overall are poorly predictive of definitive outcomes in humans. Therefore, additional studies are needed to validate or consolidate current preclinical evidence, and to assess the efficacy of CBD in patients with the aforementioned viral diseases.
Procuring CBD even for research purpose still remains a daunting task in some parts of the globe, due to restrictive national regulations. 36 Although World Health Organization has recently withdrawn CBD from the international drug control treaties, many regulatory authorities such as FDA have denied to update their restrictive position. 37 Another concern with CBD research is that CBD-based products purchased online or in shops have not been subject to the same level of regulatory scrutiny before reaching the marketplace as conventional therapies. Therefore, their purity, quality, and dosage may be unreliable. 38
In conclusion, the plausibility of CBD use for HCV and KSHV is there, but the current state of evidence is limited and only supports consolidating existing preclinical evidence through additional studies or doing clinical trials, not recommending its use. Claims about the other apparent antiviral effects of CBD abound and should push us to investigate the real benefit of CBD to overcome biases inherent in anecdotal evidence. In particular, putative usefulness of CBD in the post-Ebola syndrome 19 or for shingles-associated inflammation and pain is plausible considering the established pharmacology of CBD but needs proper assessment in well-designed clinical trials. Meanwhile, CBD sellers should stop promoting claims that are not backed by scientific evidence. Misleading claims represent both a threat to public health and a violation of consumer access to accurate information. Large international collaboration is needed to regulate online shopping and enable consumers to make an informed purchase.
CBD for Herpes: Can it Help Clear up Outbreaks?
Guess what – you probably have herpes. Even if you don’t have any active sores, it’s estimated that approximately 66% of the general population is carrying the Herpes Simplex 1 virus, and approximately 12% is carrying the Herpes Simplex 2 virus, both of which can lead to painful and unsightly breakouts in the oral and genital regions.
What if you do have active sores? Well, we know how incredibly uncomfortable, painful, and embarrassing they can be. We fully understand the need to clear them up as quickly and efficiently as possible.
As it turns out, CBD may be an effective remedy for herpes breakouts. However, it is one that a lot of people have never heard of and would never think of trying. In this article, we’ll talk about what exactly the Herpes Simplex Virus (HSV) is and how CBD works to both clear up active sores and helps to prevent and suppress breakouts in the future.
The Herpes Simplex Virus: What Is It, Exactly?
There are a lot of misconceptions surrounding herpes and the virus(es) that cause it. Namely, most people want to know whether or not oral herpes (cold sores) and genital herpes are the same.
Yes and no, as it turns out.
In order to quickly and efficiently clear up some of the common myths and inconsistencies surrounding the virus, here’s a short FAQ on all things HSV:
Herpes is a virus, plain and simple. The vast majority of the time it lies dormant in cell bodies in the oral and genital regions. However, things like stress and illness (which suppress the immune system) can cause the virus to flare up. This produces the stereotypical sores and blisters.
- How many different types of herpes are there?
Generally speaking there are two kinds of herpes; HSV Type 1 and HSV Type 2. HSV-1 is by far the more common form of the virus and is the one usually responsible for the common cold sore.
HSV-2 is less common and is the one primarily responsible for breakouts in the genital region.
- Can HSV-1 cause genital herpes? And can HSV-2 cause oral herpes (cold sores)?
Yes – via oral sex, a person can easily get genital herpes from someone with oral herpes (HSV-1). Likewise, a person can get oral herpes from someone with a genital (HSV-2) infection. In fact, it’s estimated that up to 50% of genital herpes cases arise from HSV Type-1 virus. The only way to know which form of the virus is causing lesions is to do a swab and have a laboratory type it.
- How long does herpes last? Does it ever go away?
Unfortunately, once you have HSV, you have it for life; there is no cure. However, the vast majority of the time the virus is in the latent stage, which means it lies dormant in cell bodies. This is why most people who have the virus aren’t even aware of it. When flare-ups do occur, they typically only last a few days.
- Is herpes always contagious?
The herpes virus is highly contagious, but only when the virus is shedding. Viral shedding refers to the progeny that a virus releases when it reproduces.
While contagiousness is much higher during an active breakout, viruses can (and do) shed while dormant. Thus it is entirely possible to contract HSV from someone with no active symptoms.
Herpes is transferred either through saliva (kissing, oral sex, sharing drinks), or direct skin to skin contact.
Conventional Herpes Treatments (Not CBD)
The majority of people with active herpes breakouts simply let the body’s immune system take care of it. The sores generally clear up within several days. However, in instances of severe or especially unsightly/painful breakouts, it is sometimes necessary to seek treatment.
Some common household herpes remedies have included things such as:
- OTC painkillers for pain/soreness relief (acetaminophen, ibuprofen)
- Soaking in salt/sitz baths
- Lip balms with lemon balm or lemon tea compresses
- Natural herbs like rhubarb, sage, peppermint, mint, and witch hazel oils
- Licorice root or licorice powder mixed with water or petroleum jelly (licorice root is a natural antiviral)
- Lysine creams/supplements or echinacea tea/supplements (both are immune-enhancers)
- Milk (which contains lysine and antibodies)
- Vitamin E (oils, ointments) and Vitamin E-rich foods
- Vitamin C and Vitamin C-rich foods (which boost the immune/infection-fighting cells)
There’s also no shortage of over-the-counter cold sore remedies, which include things like medicated ointments (Blistex, Carmex, etc), zinc oxide creams, Orajel (a numbing cream), and Zilactin.
In the most severe cases (or in instances where the sores last longer than a couple of weeks), some doctors will recommend pharmaceutical medications. Acyclovir (Zovirax, Sitavig) is probably the most common herpes prescription medicine. It acts as an antiviral treatment to suppress the actual HSV virus.
Other treatments include drugs like Valtrex and Famvir, which are also both antivirals that act to suppress the activity of HSV. While effective, these medications can cause side effects such as extreme fatigue, nausea, vomiting, and diarrhea.
Living With Herpes
Though uncomfortable, embarrassing, unsightly, and painful, HSV is not a particularly debilitating virus. As we said, the vast majority of the human population will live their entire lives with it. Many will not ever know it’s even there.
That being said, the presence of either form of the HSV virus can pose a risk of developing other, more serious conditions. Some of these include meningitis, chickenpox (Herpes Zoster virus), Bell’s palsy, and encephalitis. However, these instances are rare and usually only develop in cases where the individual’s immune system is suppressed or compromised.
CBD for Herpes: How It Works
As you’ve probably noticed, all forms of herpes medication act as either an antiviral or an anti-inflammatory. CBD can act as both an antiviral and an anti-inflammatory agent.
A herpes outbreak typically occurs during an illness such as the cold or flu or during heightened periods of emotional stress, menstruation, or immune-suppression caused by other medications. What’s happening is the virus is actively attacking cell tissues in mucous membranes. This is why outbreaks most commonly occur in moist mucosal regions in the mouth and genital areas.
When the virus attacks the surrounding tissue, the cells become severely damaged. This triggers immunoregulatory white blood cells to combat the attack. All of this activity is what causes the pain, inflammation, and physical appearance of herpes sores and blisters.
The cannabinoid functions by interacting with the endocannabinoid system (ECS). The ECS has receptors in every cell and tissue type in the human body. The primary role of the endocannabinoid system is to regulate and maintain internal homeostasis. Dr. Dustin Sulak of the American Academy of Cannabinoid Medicine has gone so far as to call this endogenous network the “…most important physiologic system involved in establishing and maintaining human health.”
CBD for Herpes: The best treatment methods
Antiviral and anti-inflammatory properties have been discovered in all five of the cannabis plant’s most active chemical compounds. These include:
- CBD (cannabidiol) (cannabigerol) (cannabichromene) (cannabinol)
However, CBD is many people’s preferred choice because it does not display any psychoactive properties. That is, it won’t get you high at all.
As far as treatment methods go, many people like to apply infused topical CBD creams and ointments directly to herpes sores. The quickest and most direct use of CBD for herpes, though, is in the form of oil. CBD oils are more potent than creams and are able to pack more CBD molecules in a smaller volume. Therefore, they are able to fend off HSV pathogens and clear up the inflammatory-induced sores and blisters faster.
If using CBD oil for herpes, pay close attention to the product you’re choosing. For the past three years, the FDA has been issuing warning letters to several companies for advertising “CBD oils” that contain little to none of the active cannabinoid. To help ensure that you’re getting a reliable product that actually has pure CBD, we’ve listed a few of the brands below that we consider the most reliable and most reputable over the last several years.
CBD Might Work as an Antibiotic to Treat Bacterial Infections
Experiments showed cannabidiol can squash microbes that cause staph infections.
CBD, or cannabidiol, is growing in popularity as a stress-relieving wonder drug that may help ease anxiety, inflammation and pain. Many enthusiasts also say it can cure a smorgasbord of other conditions. CBD is a non-active ingredient in cannabis — it doesn’t get you high. And that’s helped retailers avoid legal problems while plopping the substance into all manner of products.
But does the CBD chemical craze carry any weight? There’s one surprising new way it just might. New research from the University of Queensland shows CBD may actually be an effective fighter against bacterial infections — although researchers don’t think you should disregard the doctor and start self-medicating anytime soon.
The findings were presented this week at ASM Microbe 2019 by Queensland research chemist Mark Blaskovich. His team carried out test tube experiments where cannabidiol effectively squandered strains of Staphylococcus aureus , including MRSA, VISA and VRSA, which cause staph infections and have become increasingly resistant to antibiotics over the years.
However, CBD was not effective on every type of bacteria. S. aureus are Gram positive strains, which, in general, don’t have an outer membrane. And that makes them easier to treat with antibiotics than Gram negative strains. Such bacteria cause infections like E. Coli , Salmonella and Chlamydia, and have an outer membrane that is tougher to penetrate, making it typically more resistant to antibiotics.
Blaskovich’s work was partially funded by an Australian drug company called Botanix Pharmaceuticals. The company’s stock rose sharply on the news.
But it’s actually not the first time researchers have found a link between CBD and antibiotic properties. A study was published in 1976 exploring the antibiotic effects of CBD and THC , finding that Gram negative strains were resistant to both. But since then, studies on the topic have been few and far between. And these days, well-funded antibiotic research is on the decline.
“There is very little research going on in antibiotics now compared to how it was 30 years ago,” Blaskovich says. With fewer pharmaceutical companies investing in the field, most of the interest comes from academics and independent companies.
Barriers and Breakthroughs
Blaskovich’s team is preparing to do another round of trials before moving on to tests in animals, and eventually humans, if all goes well. Then, results permitting, he wants to pursue approval from the FDA to market the drug as a topical antibiotic.
Marijuana has a checkered past in the United States, but with the FDA’s approval of CBD to orally treat a rare form of epilepsy last June , Blaskovich remains optimistic.
“The road to clinical trials (and) getting it approved is probably shorter than normal,” he says. The upcoming studies will also be completed in Australia, where laws about research on cannabis are more lax.
Despite the promising first tests, Blaskovich advises curious consumers to take caution.
“The results weren’t good enough to say yes … it works,” he says. “We don’t want people to try self-medicating.”