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Gamma-aminobutyric acid, or GABA for short, is an amino acid that is naturally synthesized in the human brain. Chemically, it is a non-proteinogenic amino acid. In the human body, it functions as the most important inhibitory neurotransmitter in the central nervous system, which means that it slows down or blocks the transmission of nerve impulses across neurons. As its concentration in the brain increases, brain activity slows down and the body prepares for rest. Its concentration in the body decreases with age and exposure to physical and mental stress. It helps me when I have trouble sleeping.