By Natasha Turner, ND
Elevated levels of the stress hormone cortisol have been found to be related to memory loss and poor concentration. Phosphatidylserine (PS) belongs to a special category of fat-soluble substances called phospholipids, which are essential components of cell membranes. High concentrations of PS are found in the brain. According to studies PS may help preserve, or even improve, some aspects of mental function in the elderly.