One cup of brewed green tea (8 ounces) contains about 50-100 mg of EGCG. For most people, drinking 1-4 cups of green tea a day is generally considered safe unless you are sensitive to caffeine or oxalates. Health experts typically recommend drinking 2-3 cups of high-quality green tea a day to maximize the benefits of the catechins.

One of the main polyphenolic constituents of green tea that possesses potent antitumor, anti-inflammatory, and antioxidant properties. EGCG has been shown to inhibit PMA-induced skin thickening, activation of protein kinase C, activation of ornithine decarboxylase, and activation of interleukin-1α mRNA and protein expression.

(−)-Epigallocatechin gallate from green tea is the prime bioactive component, accounting for 50-80% of the total catechin content. It comprises a chemical structure similar to that of epicatechin gallate (ECG), an ester of gallic acid and epigallocatechin.