(-)-表没食子儿茶素没食子酸酯(50 mg)产品是A polyphenol flavonoid that displays antitumor and antioxidant properties. Inhibits telomerase and DNA methyltransferase (DNMT) and blocks the activation of EGF receptors and HER-2 receptors. Also potently and specifically inhibits chymotrypsin-like activity of the proteasome in vitro (IC₅₀= 86-194 nM) and in vivo (IC₅₀ =1 -10 uM).