... healthy products ,medicine. What is Gamma amino butyric acid (GABA) 1. Catalytically converted from glutamic acid through glutamate decarboxylase, GABA, a kind of ... the brain and calm the nerves:2,To improve sleep:3,To adjust blood pressure4,To resist fatigue:5,To ... 2. directly adding into the tea, beverages and milk products. 3. as the natural ingredients used in coffee, chocolate, apple juice ...