GABA is involved in many metabolic activities with very important physiological functions. It can calm down anxiety, reduce blood pressure, nourish brain, improve mental intelligence, improve memory and promote better sleep. GABA generates by self-regulating systems when GABA decreases in human body. GABA concentration in human brain tissue gradually reduces from middle age to old age. The insufficiency causes anxiety, restlessness, tiredness, and other mental disorders, such as memory recession, insomnia. In addition, white-collar employees are usually under high mental pressure because of work competition, which leads to body GABA lack easily. Taking the recommended dietary allowances of GABA daily can help cardio-cerebral blood pressure relief, promotes balance of amino acid metabolism in the human body, and regulates immune function. Its functions are obvious.