Theanine

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Theanine, also gamma-glutamylethylamide or 5-N-ethyl-glutamine, is an amino acid and a glutamic acid analog primarily found in tea, and also in the basidiomycete mushroom Boletus badius and in guayusa. More specifically, this compound is called -theanine, being the L- amino acid. -Theanine was discovered as a constituent of green tea in 1949 and was approved in Japan in 1964 for unlimited use in all foods, including chocolates, soft drinks, and herb teas, except infant foods.

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