Epigallocatechin gallate (EGCG) is one of four major catechins in Green Tea. Catechins are flavonoid phytochemical compounds that appear predominantly in Green Tea. Smaller amounts of catechins are also in black tea, grapes, wine, and chocolate. Due to their potent antioxidant capabilities, catechins, often referred to as "tea flavonoids," are being investigated for their ability to prevent cancer and heart disease. In experimental models, catechins show a wide range of protective effects, including cardioprotective, chemoprotective, and anitmicrobial properties. Green Tea catechins, especially EGCG, make up approximately thirty percent of the dry weight of Green Tea leaves. Of the catechins, EGCG is the most abundant one in Green Tea leaves. EGCG is the principal catechin used in supplements.