5. Phosphatidyl Serine (PS)
PS is a phospholipid, a type of fat particularly concentrated in the brain. PS helps to keep the memory related pathways functioning smoothly. Research indicates that when PS declines with age, the ability to learn, remember things, and stay alert may also decline. Depression may develop as a result of age related PS insufficiency. PS plays an important role in maintaining the integrity of brain cell membranes by efficient transport of energy producing nutrients into cells, enhancing brain cell energy metabolism.