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Phosphatidylserine (abbreviated Ptd-L-Ser, or PS) is a phospholipid component, usually kept on the inner-leaflet, the cytosolic side, of cell membranes by an enzyme called flippase. When a cell undergoes apoptotic cell death phosphatidylserine is no longer restricted to the cytosolic part of the membrane, but becomes exposed on the surface of the cell. First pilot studies indicate that PS supplementation might be beneficial for children with attention-deficit hyperactivity disorder PS can be found in meat fish, but is most abundant in the brain and in innards such as liver and kidney. Only small amounts of PS can be found in dairy products or in vegetables, with the exception of white beans.