Cyto-Matrix GABA - 500mg 90 Veggie Caps500mg of pure GABA per capsule to support stress, sleep and mood. GABA is an inhibitory neurotransmitter in the brain, responsible for calming the overactive central nervous system GABA has been studied for its ability to improve mood, sleep parameters and both subjective and objective markers of the stress response 500mg of pure GABA per capsule Gamma aminobutyric acid, most commonly referred to as GABA, is the major inhibitory neurotransmitter found