Metabolic Maintenance PS-100 (Phosphatidylserine) supports normal memory, cognition, modulates cortisol response, promotes restful sleep, maintains neuron health and communication. Phosphatidylserine (PS) is a phospholipid that is critical to the maintenance of cellular function. PS is particularly concentrated in the brain and helps to keep heartbeat coordination, hormone secretion, and memory-related pathways functioning smoothly. Recommended Use: Take 1 to 3 softgels daily, or as directed by a healthcare professional. Best taken with meals.