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Theanine

Theanine, or 5-N-ethyl glutamine, is a non-protein amino acid. Theanine is rare in nature, being most commonly found in tea leaves (Camellia sinesis) and other species of Camellia, as well as edible bay boletes mushrooms (Xerocomus badius). Theanine is a glutamic acid derivative contained in tea-leaves, which is the main component of deliciousness (umami) of tea. It is also used as a food additive for seasoning. Theanine is well acknowledged as a main component of green tea flavor substance, and therefore, is an important component of food essence. In addition, gamma-glutamyl derivatives including theanine were reported to suppress convulsion induced by caffeine intake. Theanine has been found to be increasingly associated with therapeutic benefits in the areas of cardiovascular health and cancer treatment. Specifically, theanine appears to help lower blood pressure and enhance the effects of chemotherapeutic agents. Theanine also has a reputation for promoting mental and physical relaxation, and decreasing stress and anxiety without inducing drowsiness.

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