Although structurally related to yohimbine, the pharmacology of Kratom is quite different. It contains many alkaloids that are just now beginning to be understood as well as alkaloids found in Una de gato, which are thought to play a beneficial role on the immune system and promote lower blood pressure, and epicatechin, a powerful antioxidant also found in dark chocolate and closely related to the EGCG that gives green tea its beneficial effects.