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L-Theanine BP/USP
Researchers have found that L-theanine works by supporting the formation of GABA (gamma-aminobutyric acid), an inhibitory neurotransmitter that blocks the release of the neurotransmitters dopamine and serotonin to promote a state of deep relaxation and calm, while increasing sensations of pleasure. L-theanine has also been found to directly stimulate the production of alpha brain waves, which are associated with deep states of relaxation and enhanced mental clarity. In a recent study, Japanese researchers also revealed that?in addition to promoting a deep state of relaxation?L-theanine may also support healthy blood pressure levels, enhance concentration and learning, promote mental clarity and strengthen the immune system.
L-theanine is a free (non-protein) amino acid found almost exclusively in tea plants (Camellia sp.), constituting between 1 and 2-percent of the dry weight of tea leaves. It is the predominant amino acid in green tea leaves, giving tea its characteristic umami or 5th taste (besides the four traditional tastes: sweet, salty, acid, and bitter). Attempts to isolate the L-theanine, with its physical and neurological benefits, from the tea leaves were once difficult, expensive, and inefficient. Economically feasible methods of producing the identical L-theanine now exist and do not require a mountain of tea leaves.
L-theanine has a significant effect on the release or reduction of neurotransmitters like dopamine and serotonin, resulting in improved memory and learning ability. L-theanine may also influence emotions due to its effects on the increased release of dopamine. L-theanine reduces brain serotonin concentration by either curtailing serotonin synthesis or increasing degradation in the brain.
The regulation of blood pressure is partly dependent upon catecholaminergic and serotonergic neurons in both the brain and the peripheral nervous system. Studies on spontaneously hypertensive rats (SHR) showed an impressive blood pressure lowering effect with L-theanine. The lowered blood pressure effect was dose-dependent with the highest test dose creating the most significant drop. L-glutamine was used as one of the controls. Although L-glutamine is similar in chemical structure to L-theanine, it did not exhibit an anti-hypertensive effect
L-Theanine BP/USP
