Displaying 2 results of Glycerophosphocholine Impurities Glycerophosphocholine (GPC) is a naturally occurring compound found in the human body and certain foods. However, during the manufacturing process of GPC, impurities can be introduced. These impurities can affect the quality, purity, and safety of the final product. Common impurities in GPC include residual solvents, heavy metals, and microbial contaminants. It is important to closely monitor and control these impurities to ensure the safety and efficacy of GPC for its intended use in supplements