But now, experts want to make sure that people understand exactly what type of green tea provides the best benefits.
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The ingredient that makes green tea so powerful is epigallocatechin gallate (EGCG), which is a very powerful antioxidant. Researchers measured the levels of EGCG in different types of green tea — leaf tea, ready-made bottled tea, and green tea supplements — and found that the amounts of the beneficial antioxidant varied dramatically.
Depending on the brand, supplements provided anywhere from 22 milligrams to 300 milligrams of EGCG per serving (depending on the brand), bottled green-tea beverages contained as little as 4 milligrams of the compound per cup to zero milligrams, regardless of how many milligrams were promised on the bottle.