One of the active constituents of green tea believed to be responsible for its many health and appearance benefits, both orally and topically. The chief benefit of epigallocatechin-3-gallate is skin-soothing and antioxidant.
References for this information:
Rheumatology, July 2010 Epublication
Food and Chemical Toxicology, April 2008, pages 1,298-1,307