Immune support. Promotes antioxidant activity. Herbals. Potent source of EGCG antioxidants to fight free radical oxidation. Green Tea has been known for its therapeutic properties for centuries. Popular in both traditional Chinese and herbal medicines, Green Tea is a powerful antioxidant that is beneficial for many facets of general health. Its antioxidant properties are due mostly to substances known as polyphenols, most importantly epigallocatechin gallate, or EGCG. These components work to combat free radical damage and promote optimal health. Each serving of Green Tea Extract is equivalent in polyphenol content to 4 to 6 cups of tea.