Catechin is a natural antioxidant that provides tons of health benefits such as cancer prevention, weight loss, and high blood pressure reduction. High concentrations of Catechin can be found especially in tea, cocoa, and kernel fruits. Catechin has a bitter and astringent taste which you could be found particularly in Green Tea, since the tea doesn’t go through any fermentation process but is just steamed and dried after being picked off from the tea trees.