As we have talked about previously, the endocannabinoid system (ECS) is responsible for regulating most functions in the human body. One of these functions is our immune response. Cannabinoids (like CBD) interact with our ECS. When our ECS is active, it helps to aid our body in bringing itself back into balance (homeostasis). When our body is in balance, it is more likely to make sure proper immune function and regulation is occurring.