The endocannabinoid system or ECS is distributed throughout the body, however, it is most concentrated in the central and peripheral nervous systems. The ECS is composed of two cannabinoid receptors (CB1 and CB2), the compounds in our bodies that naturally activate them (endocannabinoids), and the enzymes that break down those compounds. The ECS responds to both the cannabinoids produced in the body (endocannabinoids) and responds to cannabinoids produced by plants (phytocannabinoids). The ECS helps the body maintain homeostasis, which means providing a state of internal stability necessary for survival, despite fluctuations in our external environment. It helps to regulate, through maintenance of homeostasis, physiological and cognitive processes including pre- and postnatal development, appetite, pain sensation, mood, and memory.