L-theanine

L-theanine is an amino acid that is commonly present in green tea and in small amounts in Bay Bolete mushrooms. This compound is believed to be responsible for the “umami” flavor of green tea. Aside from its soothing taste, L-theanine promotes relaxation and helps the body fight stress by affecting the levels of brain chemicals or neurotransmitters such as dopamine (regulates mood, sleep and emotion) and the stress hormone cortisol. For people who don’t regularly consume tea products, L-theanine is also available in pill or tablet form at many health food stores.