Promotes Brain Function Cogni-PS Phosphatidylserine Dietary SupplementPhosphatidylserine (PS) is a natural phospholipid that is an essential component of cell membranes. Cogni-PS promotes brain function by helping maintain neuronal membrane fluidity (cell-to-cell communication), which is associated with cognition, mental performance, attentiveness and reaction time. PS protects against stress-induced activity, reducing the action of cortisol (catabolic stress hormone).Cogni-PS is a concentrated form of phosphatidylserine that offers superior stability.