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Epigallocatechin gallate (EGCG) is one of four major catechins in green tea. Catechins belong to the flavan-3-ol class of flavonoids. Green tea catechins are the flavan-3-ols found in green tea leaves. All catechins including EGCG are polyphenolic substances. Black tea leaves have a much lower content of these catechins. That's because black tea leaves undergo extensive fermentation, during which the majority of the catechins are enzymatically oxidized to the major pigments of black tea leaves, theaflavin and thearubigen
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The health benefits of tea have been touted for infusions made from the plant Camellia sinensis for over 4700 years; ever since its discovery was attributed to the legendary emperor, Shennong. The Shen Nong Ben Cao Jing claimed its taste and stimulative properties were useful for treating tumors, abscesses, bladder ailments, lethargy, among other conditions
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