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L-theanine is a non-protein amino acid mainly found naturally in the green tea plant (Camellia sinensis) . green tea extract

L-theanine is the predominant amino acid in green tea and makes up 50% of the total free amino acids in the plant. The amino acid constitutes between 1% and 2% of the dry weight of green tea leaves.

L-theanine is considered the main component responsible for the taste of green tea, which in Japanese is called umami.

L-theanine is marketed in Japan as a nutritional supplement for mood modulation.

L-theanine is a derivative of L-glutamic acid. It is a water-soluble solid substance with the molecular formula C7H14O3 N and a molecular weight of 160. 19 daltons.

L-theanine is also known as gamma-ethylamino-L-glutamic acid, gamma-glutamylethylamide, r-glutamylethylamide, L-glutamic acid gamma-ethylamide and L-N-ethylglutamine.