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.
And the final nail in industrial hemp’s proverbial coffin: Federal law in the United States prohibits the use of hemp leaves and flowers to make drug products. That said, isolating CBD nullifies these distinctions, rendering its source irrelevant as CBD isolate contains nothing but CBD. In this case, the differences between industrial hemp and whole-plant marijuana are far less significant.
 S. Maione, F. Piscitelli, L. Gatta, D. Vita, L. De Petrocellis, E. Palazzo, V. de Novellis, and V. Di Marzo, “Non-psychoactive Cannabinoids Modulate the Descending Pathway of Antinociception in Anaesthetized Rats through Several Mechanisms of Action,” British Journal of Phramacology 162, no. 3 (2011): 584. doi:10.1111/j.1476-5381.2010.01063.x.
“For the relief of certain kinds of pain, I believe, there is no more useful medicine than Cannabis within our reach,” wrote Sir John Russell Reynolds, neurologist, epilepsy research pioneer, and physician to Queen Victoria back in 1859. In fact, cannabis was used for pain relief in all of the major ancient civilizations from Asia through the Middle East and into Europe and the Americas. The scientific inquiry into cannabis over the past several decades has confirmed that it is an effective and safe analgesic for many kinds of pain.
Derived from the stalk and seed of cannabis (hemp) plants, cannabidiol (CBD) oil or CBD hemp oil is a natural botanical concentrate that is high in the compound CBD. Of the more than 85 cannabinoids so far identified in the cannabis plant, CBD is the second most common after tetrahydrocannabinol (THC). Unlike THC, CBD is non-psychotropic and therefore doesn’t cause a euphoric high.
Most CBD oils are available in round-number concentrations such as 250mg, 500mg, and 1,000mg. While these strengths accommodate many CBD users, they may not be sufficient for those with preferences that fall outside round numbers. NuLeaf Naturals offers a less conventional selection of concentrations: 240mg, 725mg, 1,450mg, 2,425mg, and 4,850mg. This range ensures that most users will find a strength that works for them.
A 2016 literature review indicated that cannabidiol was under basic research to identify its possible neurological effects, although as of 2016, there was limited high-quality evidence for such effects in people. A 2018 meta-analysis compared the potential therapeutic properties of "purified CBD" with full-plant, CBD-rich cannabis extracts with regard to treating refractory (treatment-resistant) epilepsy, noting several differences. The daily average dose of people using full-plant extracts was more than four times lower than of those using purified CBD, a possible entourage effect of CBD interacting with THC.
Those warning letters aside, there’s not a lot of federal oversight right now over the claims being made or the products that are being sold. Cohen warned against buying CBD products online, because “there’s a lot of scams out there.” Yet his clinic sells CBD, and he admits, “I say ‘Don’t buy online,’ but ours is worth doing, because we know what we’re doing. We ship all over.”
Cannabinoids are facilitative of the process of bone metabolism—the cycle in which old bone material is replaced by new at a rate of about 10 percent per year, crucial to maintaining strong, healthy bones over time. CBD in particular has been shown to block an enzyme that destroys bone-building compounds in the body, reducing the risk of age-related bone diseases like osteoporosis and osteoarthritis. In both of those diseases, the body is no longer creating new bone and cartilage cells. CBD helps spur the process of new bone-cell formation, which is why it has been found to speed the healing of broken bones and, due to a stronger fracture callus, decrease the likelihood of re-fracturing the bone (bones are 35–50 percent stronger than those of non-treated subjects).