$CBDD Many people hearing about CBD for the first time are skeptical of descriptions of it as a cure-all. But there is a reason CBD can treat so many diverse conditions. Humans have what is called an endocannabinoid system. This is a system of neurotransmitters that runs throughout the central and peripheral nervous systems and include two receptors that respond to CBD, and since these receptors are found throughout the body, the results are systemic.