L-theanine, or theanine, is an amino acid found in tea. Theanine is an interesting amino acid in that it can cross the blood-brain barrier. Theanine has some psychoactive properties. L-Theanine can reduce stress, both mental and physical, induce relaxation, heighten cognitive function, and enhance mood.
It is thought that theanine's affects on the brain are a direct result of the increased production of GABA (gamma-aminobutyric acid), serotonin, and dopamine. Theanine relaxes the nerves and has been shown to improve memory retention and learning. This remarkable amino acid has been shown to stimulate alpha waves in the brain, and alpha brain waves promote a relaxed and alert feeling.
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