June 15, 2009
Image of L-Theanine 3D Image of L-Theanine

L-Theanine, or L-2-amino-4-(ethylcarbamoyl)butyric acid, is found in tea leaves and the mushroom Boletus badius. A May article in the Los Angeles Times suggests that L-theanine can help you improve your concentration and mental stamina. The amino acid has been added to some SoBe, Vitamin Water, and Gatorade products.

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