EGCG, which stands for epigallocatechin gallate, is found in tea and adds to the slightly bitter flavor of the drink. Green tea has been studied to measure the healthful effects of ECGC on people.


ECGC is a compound that is part of a group called polyphenols. It is a catechin, a tannin with antioxidant qualities.

Effects On The Body

ECGC is the most bioactive of the green tea catechins. This means that the green tea ECGC component has the most effect on the body. Studies have shown a positive role in cancer prevention and maintenance of cholesterol levels. It may also help fight hardening of the arteries, Alzheimer’s disease and Parkinson’s disease. Most of the studies, however, have used an extract of green tea rather than green tea itself because of the low availability of catechins in tea form as opposed to extract form.

Green Tea

Because green tea is the least fermented of teas, it has the highest polyphenol concentration, more than black or oolong tea, and so has the highest bioavailability of ECGC.