Phosphatidylserine (PS)the key to ageing? PS is a unique phospholipid that plays a crucial role in maintaining the health of your brain cells. Phosphatidylserine offers various health benefits, including enhancing brain power, managing stress, acting as an antioxidant, and supporting post-exercise recover. While the levels of phosphatidylserine in the brain tend to decline with age, it can be found in certain foods like soybeans, egg yolks, and liver or obtained through supplements.