GABA 500 mg Veg Capsules. 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. NEUROTRANSMITTER SUPPORT: GABA is naturally produced in the body and its presence within the central nervous system may help promote relaxation and ease nervous tension. Take 1 capsule 2 to 3 times daily as needed, preferably with juice or water on an empty stomach. GAMMA AMINOBUTYRIC ACID/WITH VITAMIN B-6: GABA (Gamma-Aminobutyric Acid)