Glycerolphosphocholine (GPC) is a water-soluble small molecule substance that exists normally in the human body. It is the biosynthetic precursor of the important neurotransmitter acetylcholine. The most important role of GPC is that the chemical choline it produces is a water-soluble vitamin B group, which plays an important role in the brain and nervous system. Studies have shown that GPC plays an important role in the production of certain hormones and neurotransmitters such as acetylcholine and human growth hormone, thereby supporting the functions of the brain and nervous system.