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l-theanine

l-theanine

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Theanine is an amino acid (a building block for proteins) found in green tea. People use theanine for treating anxiety and high blood pressure, for preventing Alzheimer's disease, and for making cancer drugs more effective.

An amino acid found primarily in black and green tea, L-theanine is partly responsible for the beverage's impact on mood. It appears to alter levels of various neurotransmitters, producing a calming effect that helps counter the stimulating action of the caffeine in tea.