The existence of substantial clinical investigations regarding CBD has been made public. For example, two such substantial clinical investigations include GW Pharmaceuticals’ investigations regarding Sativex and Epidiolex. (See Sativex Commences US Phase II/III Clinical Trial in Cancer Pain and GW Pharmaceuticals Receives Investigational New Drug (IND) from FDA for Phase 2/3 Clinical Trial of Epidiolex in the Treatment of Dravet Syndrome ).
CBD directly interacts with a number of proteins in the body and central nervous system, a few of which are components of the endogenous cannabinoid system. For instance, CBD binds to both the CB1 and CB2 cannabinoid receptors, but it binds in a way that sets off a reaction that is essentially the opposite of what THC does. CBD is an inverse agonist, while THC is an agonist at CB1. Simply put, CBD is not intoxicating; at the molecular level, it does the opposite of what THC does. Our bodies have several other receptor proteins that participate in the endogenous cannabinoid system (GPR3, GPR6, TRPV1 and TRPV2, for example). CBD binds to all of these, and many of its anti-inflammatory and pain-relieving effects may occur through these pathways.