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