GABA (Gamma-Aminobutyric Acid) is a non-protein amino acid that functions as a neurotransmitter in the human brain. GABA is naturally produced in the body and its presence within the central nervous system may help promote relaxation and ease nervous tension. With Vitamin B6

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In one study, GABA levels in people with insomnia were almost 30 percent lower than in people without the sleep disorder. And these low GABA levels also corresponded to more restless, wakeful sleep.