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However, the effect of CBD on each addiction type was often very different. With opioid addiction, for example, CBD showed little effect in minimizing withdrawal symptoms in the absence of THC. By contrast, CBD on its own appeared effective in minimizing drug-seeking behaviors in users of cocaine, methamphetamine, and other psychostimulant drugs.

According to a 2017 study in the Journal of the American Medical Association, only 30.95% of CBD products sold online were correctly labeled. Most contained less CBD than advertised, while 21.43% had significant amounts of THC.

Nerve Pain

CBD oil may reduce the risk of heart disease by alleviating hypertension (high blood pressure) in certain people, suggests a 2017 study in JCI Insight.  

CBD oil comes as full-spectrum oils or in forms that contain CBD isolates. Unlike isolates, which contain CBD only, full-spectrum oils contain a variety of compounds found naturally in the cannabis plant, including proteins, flavonoids, terpenes, and chlorophyll. Alternative practitioners believe these compounds offer more substantial health benefits, although there is no clear evidence of this.

To avoid interactions, tell your doctor and pharmacist about all prescription, over-the-counter, herbal, or recreational drugs you are taking.

There are two possible exceptions to this. The first is that some people, for unknown reasons, just react differently to CBD. According to Dr. Chin, about 5% of people say they feel altered after taking CBD. "Usually they're the same people who have side effects from Advil or Tylenol," she says. You never know how your body will react to any new supplement, so when taking CBD for the first time, do so safely under supervision.

These policies vary widely. Marijuana and CBD are currently fully legal for both medicinal and recreational purposes in Alaska, California, Colorado, Maine, Massachusetts, Michigan, Nevada, Oregon, Vermont, Washington, and Washington D.C. In 23 states, it's legal in some form, such as for medicinal purposes. Another 14 states permit just CBD oil. But both are illegal in Idaho, Nebraska, and South Dakota. For more information, the organization Americans for Safe Access has a helpful guide to the specific laws in each state.

Where does hemp come in to all this?

This means that "consumers everywhere, if they're compliant with their state, can grow hemp and use hemp products," Parrish explains, "and among those will be CBD."

There are two main types of pain, Dr. Danesh says: musculoskeletal and nerve. "There could be benefit for both conditions," he says.

In other words, the latest bill removed hemp from the Drug Enforcement Administration, or DEA's, purview. "Hemp can now be grown freely under federal law, which, of course, is huge," Parrish says. "But while it's legal under federal law, it's up to each state to set their own policy."

Resstel LB, Joca SR, Moreira FA, et al. Effects of cannabidiol and diazepam on behavioral and cardiovascular responses induced by contextual conditioned fear in rats. Behav Brain Res 2006;172(2):294-8. View abstract.

Leweke FM, Piomelli D, Pahlisch F, et al. Cannabidiol enhances anandamide signaling and alleviates psychotic symptoms of schizophrenia. Transl Psychiatry 2012;2:e94. View abstract.

Booz GW. Cannabidiol as an emergent therapeutic strategy for lessening the impact of inflammation on oxidative stress. Free Radic Biol Med 2011;51(5):1054-61. View abstract.

Interactions ?

Izgelov D, Davidson E, Barasch D, Regev A, Domb AJ, Hoffman A. Pharmacokinetic investigation of synthetic cannabidiol oral formulations in healthy volunteers. Eur J Pharm Biopharm. 2020;154:108-115. View abstract.

Arkell TR, Vinckenbosch F, Kevin RC, Theunissen EL, McGregor IS, Ramaekers JG. Effect of Cannabidiol and ?9-Tetrahydrocannabinol on Driving Performance: A Randomized Clinical Trial. JAMA. 2020;324(21):2177-2186. View abstract.

Weiss, L., Zeira, M., Reich, S., Har-Noy, M., Mechoulam, R., Slavin, S., and Gallily, R. Cannabidiol lowers incidence of diabetes in non-obese diabetic mice. Autoimmunity 2006;39(2):143-151. View abstract.

Crippa JA, Derenusson GN, Ferrari TB, et al. Neural basis of anxiolytic effects of cannabidiol (CBD) in generalized social anxiety disorder: a preliminary report. J Psychopharmacol 2011;25(1):121-30. View abstract.