EGCg (Epigallocatechin gallate)is the active component of green tea and is valued for its anti-oxidant properties. It has been studied extensively in cancer and other degenerative diseases, and for weight loss through the promotion of fat metabolism. This product is standardized to contain a high percentage of the active ingredient, 50% EGCg from 500mg green tea. This product does not contain caffeine. Usual dose is 1 capsule daily with meals, or as directed by your physician.