... an important neurotransmitter of the central nervous system for mammals.2. GABA can be found in our eye retinas and ... and cosmetics. 2. directly adding into the tea, beverages and milk products. 3. as the natural ingredients used in coffee, chocolate, apple ... juice, cocoa, yogurt, milk sugar, butter, toast, bread, instant noodles and other functional food and drinks. CAS NO. 56-12-2 ...