L-theanine, a water-soluble amino acid, is found mainly in green and black tea, and to a lesser extent in mushrooms. It constitutes between 1 and 2 percent of the dry weight of tea. Passing through the blood-brain barrier within 30 minutes, it is used for stress relief, anxiety, concentration and focus. It is said to generate creativity, a state of wakeful relaxation, and higher learning via the ability to ignore distracting information during complex tasks. L-theanine has demonstrated benefit for patients diagnosed with anxiety by increasing levels of dopamine and GABA in the brain.
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