Phosphatidylethanolamine (cephalin) is a phospholipids (lipid complex) from the group, which also includes phosphatidylcholine, phosphatidylinositol, occurring in the brain. They form a lecithin, or is synthesized from other phospholipids (phosphatidylserine). It affects the stability of cell membranes, by stimulating lipid profile. Ethanolamine, which is derived from phosphatidylethanolamine, affects the metabolism of fats. Phosphatidylethanolamine is a component of a nutritional, functional and vitamin supplements, usually with together other composite fats.