Phosphorylethanolamine (Monoaminoethyl phosphate) is a membrane phospholipid and an important precursor of Phosphatidylcholine. It is found in most animal tissues and various human extracranial tumors, playing a critical role in membrane integrity, cell division, mitochondrial respiratory function, and more. Studies have shown that changes in the abundance of Phosphorylethanolamine are associated with Alzheimer's disease and Parkinson's disease. Lowering the ratio of Phosphorylethanolamine to Phosphatidylcholine in the liver can improve insulin signaling. Phosphorylethanolamine holds promise for research in the fields of cancer, neurodegenerative disorders, and metabolic diseases.