Cogni-PS Phosphatidylserine Promotes Brain Function 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 essential for cognition, mental performance, attentiveness and reaction time. PS protects against stress, reducing the action of cortisol (catabolic stress hormone).Cogni-PS is a concentrated form of phosphatidylserine derived from soy phospholipids and offers superior stability.