... . What is Gamma amino butyric acid (GABA) 1. Catalytically converted from glutamic acid through glutamate decarboxylase, GABA, a kind of natural non-protein amino acid, is an ... important neurotransmitter of the central nervous system for mammals.2. GABA can be found ... , bread, instant noodles and other functional food and drinks. GABA (Gamma Amino butyric acid )