When you consume a THC capsule, the cannabinoids within those capsules work with the endocannabinoid system (ECS) in your body. After you’ve digested the capsule, the cannabinoids work their way into the bloodstream and begin to provide results in the places that your body needs most.
THC, in particular, is a cannabinoid that works with both the CB1 and CB2 receptors in the ECS (though it does bind more strongly to CB1s), providing full-bodied results such as euphoria and relaxation.