L - a - glycerin phosphatidyl choline (L - a - glycerylphosphorylcholine, GPC) is also called choline phosphate, choline phosphoric acid glyceride, glycerol phosphate ester. It is phosphatidylcholine, the product of the complete hydrolysis of the two fatty acyl groups on the lecithin molecule. It is a water-soluble phospholipid precursor and neurotransmitter naturally present in the human body. It is also a unique cytoprotective agent that can support the fluidity and integrity of the cell membrane. Years of experimental research and clinical application have shown that GPC can not only improve people's memory and cognitive ability, but also have a significant effect on the decline of cerebral circulation and Alzheimer's disease. In addition, it can resist muscle atrophy and protect blood vessels. In 2012, it was confirmed as GRAS (Generally Recognized as Safe Substance) by the FDA.