Neurotransmitter Support Gamma-Aminobutyric Acid Non-GMO A Dietary Supplement Vegetarian-Vegan Amino Acids Family Owned Since 1968 GMP Quality AssuredGABA (Gamma-Aminobutyric Acid) is a non -protein amino acids 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.