Delta 8 THC and delta 9 THC are two different cannabinoids. Delta 9 THC is the active psychoactive ingredient in marijuana. It is stronger, because delta 8 is the natural result of the oxidization of delta 9 in the plant material. Delta 8 THC is one isomer off of Delta 9, and therefore has similar effects. However, it is not as good of an antagonist to our receptors, meaning it will be less potent to the body. With a potency of 50%-70% of regular THC.
