Epigallocatechin Gallate (EGCG) is an ingredient extracted from Chinese green tea leaves. As the main active and water-soluble component of green tea, EGCG has the highest content of catechin, accounting for 9% to 13% of the gross weight of green tea leaves. Due to its special stereochemical structure, EGCG has very strong antioxidant activity. They play an important role in fighting cancer and cardiovascular disease. In addition, it is also used as a reversal agent for multi drug resistance in tumors, improving the sensitivity of cancer cells to chemotherapy and reducing toxicity to the heart.