Pure Encapsulations PS Plus 60cPure Encapsulations PS Plus offers support for the brain, nerves and cells. Your brain is made up of a number of cells; among these cells is phosphatidylserine which is a chemical responsible for facilitating cell to cell communication. This cell helps ensure healthy cognitive functioning perception and memory. Usually your body can make its own phosphatidylserine but it gets most of what it requires from food sources like cabbage and soy.