Cannabidiol (CBD) hemp oil is extracted from the hemp plant, which is high CBD, low THC, unlike medical marijuana products, which are usually made from plants with high concentrations of psychoactive tetrahydrocannabidiol (THC). Because hemp contains only trace amounts of THC, hemp oil products are non-psychoactive, so you never feel "high".
CBD interacts with our endocannabinoid system, responding to receptors in our body. CB1 receptors are located primarily throughout the brain and central nervous system. CB2 receptors are located in the immune system and act in neural communication. The endocannabinoid system aids in maintaining our body's homeostasis, or general state of balance, impacting such functions as mood, sleep, appetite, hormone regulation, pain and immune response.