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L-Theanine is naturally occurring at high concentrations in the leaves of the green tea plant Camellia sinensis. It can also be found in the non-edible mushroom Xerocomus badius. L-Theanine accounts for approximately 1-2% of the dry weight of tea leaves and is water-soluble (Borzelleca et al., 2006). Steeping C. sinensis leaves in hot water creates tea, the most commonly consumed beverage in the world. After steeping, the majority of theanine is solubilized (Ekborg-Ott et al., 1997).
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