One of the most profound uses of cannabidiol oil is for the relief of arthritic pain. There are two kinds of arthritis, rheumatoid and osteoarthritis, both resulting in swelling and stiffness in joints. Scientific studies have documented that the application of CBD oil can help assuage the pain caused by inflammations. Results have been encouraging. Health associations and the government, alike, are optimistic about the role of CBD oil in bringing solace to arthritic patients.
Here, the evidence is not going to make them happy. A 2017 study in JAMA reported that only 26 of 84 samples of CBD oils, tinctures and liquids purchased online contained the amount of CBD claimed on their labels. Eighteen of them contained THC, which could lead to intoxication or impairment in some individuals. And a quarter had less CBD than advertised. The F.D.A. has likewise found many products that did not contain the amount of CBD they were claiming.
CBD and THC interact with our bodies in a variety of ways. One of the main ways they impact us is by mimicking and augmenting the effects of the compounds in our bodies called “endogenous cannabinoids” - so named because of their similarity to the compounds found in the cannabis plant. These “endocannabinoids” are part of a regulatory system called the “endocannabinoid system”.
Marijuana can produce acute psychotic episodes at high doses, and several studies have linked marijuana use to increased risk for chronic psychosis in individuals with specific genetic risk factors. Research suggests that these effects are mediated by THC, and it has been suggested that CBD may mitigate these effects.xxxi There have been a few small-scale clinical trials in which patients with psychotic symptoms were treated with CBD, including case reports of patients with schizophrenia that reported conflicting results; a small case study in patients with Parkinson’s disease with psychosis, which reported positive results; and one small randomized clinical trial reporting clinical improvement in patients with schizophrenia treated with CBD.xxxii Large randomized clinical trials would be needed to fully evaluate the therapeutic potential of CBD for patients with schizophrenia and other forms of psychosis.