L-Theanine is a naturally occurring amino acid found primarily in tea leaves, particularly in green tea (Camellia sinensis). It is known for its calming and relaxing effects on the mind and body. L-Theanine is structurally similar to glutamate, a neurotransmitter involved in transmitting nerve impulses in the brain, and gamma-aminobutyric acid (GABA), a neurotransmitter that promotes relaxation and reduces anxiety.
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