Neurotransmitter Support Gamma-Aminobutyric Acid Non-GMO A Dietary Supplement Vegetarian - Vegan Kosher Amino Acids Family Owned Since 1968 GMP Quality AssuredGABA (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.