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The amino acid l-theanine is one of the most versatile of all the naturally sourced nootropics. Sourced from Camellia sinensis (tea leaves) it is most apparent in green tea. L-theanine is also present in much smaller doses in black tea and can also be found in guayusa. L-theanine is considered calming but is not actually sedative. L-theanine is not an

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