Phosphatidylserine is a phospholipid found in cell membranes, particularly in the brain. It plays a crucial role in cell signaling and helps maintain the structural integrity of cells. This compound is essential for cognitive functions, including memory and learning. Supplementing with phosphatidylserine may support brain health and improve mental performance, especially in older adults. It is naturally present in foods like soybeans, white beans, and certain fish. Research suggests that it may also help reduce stress and improve mood by regulating cortisol levels in the body.