Phospholipids are an integral part of biological membranes, and they tend to decrease as we age. Together, phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI) and phosphatidylserine (PS) help achieve proper health. This rapidly absorbed blend provides 5,900 mg* of naturally bioavailable phosphatides per serving, making it one of the most concentrated preparations available.