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Black and green tea are made from the same plant, but black tea has been allowed to oxidize, altering its constituents. While green tea is high in catechins (especially epigallocatechin gallate, or EGCG), black tea contains relatively high levels of theaflavins, theanine, and thearubigens. Although green tea is more commonly presented as a healthful beverage, traditional black tea too might have health-promoting properties. However, there is no reliable evidence as yet for any of its proposed health benefits.
Optimal doses of black tea or its constituents are not known.