... nervous system CAS NO.: 56-12-2MF: C4H9NO2ASSAY: 99%GABA (gamma-aminobutyric acid) is a non-protein amino acid ... "inhibitory" (i.e., they tend to suppress neuron firing). GABA, which is produced from glutamate, is an inhibitory neurotransmitter. In ... it's the primary inhibitory neurotransmitter in the brain.Since GABA is a naturally-occurring, easily synthesized, physiologically-important compound, ...