... glutamic acid through glutamate decarboxylase, GABA, a kind of natural non-protein amino acid, is an important neurotransmitter of ... the tea, beverages and milk products. 3. as the natural ingredients used in coffee, chocolate, apple juice, cocoa, yogurt, milk sugar, ... other functional food and drinks. Model 5,Microbial fermentation,Natural,Rice acrospire powder rich in gamma-amino butyric acid (GABA)