Green Tea Standardized Extract contains 300 mg of green tea extract, standardized to 50% polyphenols in a capsule. Green Tea has been used for centuries for its positive effects on overall health. The active ingredients of green tea are known as polyphenols. The polyphenols that demonstrate the most significant biological effect are the catechins, particularly epigallocatehin gallate or EGCG. They support normal healthy cell growth while providing antioxidant protection and support for a healthy metabolism.