Epigallocatechin gallate (EGCG) is a catechin polyphenol and the main active compound in green tea. Many supplements standardize this ingredient to high purity, often above 90 percent EGCG. People take it for concentrated antioxidant support.
Unlike broad green tea extracts, this form isolates EGCG alone. That isolation can mean more consistent dosing and better absorption. Some users prefer it for targeting cardiovascular health and metabolic balance, especially when they want a steady amount of EGCG without the variation found in whole extracts.
Take it with food, particularly if you use a capsule or powder. High doses of EGCG can stress liver function. Anyone with a liver condition or taking medications processed by the liver should be careful.