Cannabinoids are a naturally produced and diverse class of organic chemical compounds that are found in all living things. Cannabinoids produced within plants are called phytocannabinoids. Cannabinoids produced within humans and animals are called endocannabinoids.
There are hundreds of endocannabinoids contained in the human body that alter the release of neurotransmitters when acted upon our neural cell receptors (CB1 and CB2). These receptors are found throughout the brain and the body, with CB1 occurring mostly in the former and CB2 the latter.
Photocannabinoids are almost identical in physical structure to endocannabinoids, which is why they can interact with the endocannabinoid systems in humans and animals.