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Green tea extract (EGCG)
A concentrated supplement made from green tea (Camellia sinensis) leaves, standardized for its catechins — chiefly EGCG (epigallocatechin gallate) — and usually containing some caffeine and a small amount of the amino acid theanine. Taken as capsules or tablets.
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Worth knowing
Very high doses of concentrated green tea extract have been linked to reports of liver injury in some people; keeping to label amounts and taking it with food are common precautions.