an important inhibitory neurotransmitter in Central Nervous System. It is a non-essential amino acid which functions as an inhibitory calming neurotransmitter in your brain. It is found in high concentrations only in your brain & eyes. It can be derived from protein foods or manufactured in your body from glutamic acid. Data sheet； Purity >=5%~90% Moisture <=7% Plumbum (pb) <=0.5ppm Arsenum <=0.5ppm TPL <=1500/g E.coli <=30/100g Pathogens None Physical state Light or brown yellow powder