Dealing with the stress of daily living takes all your faculties, especially the optimal health of your brain and nervous system. Gamma-Aminobutyric Acid (GABA) is known for its importance in nervous system functioning and for working with the mood centers of the brain. GABA 750 mg can help support relaxation when faced with with mild, occasional stress. GABA is an amino acid naturally produced by the body that functions as a neurotransmitter in the central nervous system. As a neurotransmitter, GABAs role is to support cellular function.