NOW Soy-Free Phosphatidyl Serine is a phospholipid compound derived from non-GMO sunflower lecithin. Phosphatidyl serine plays an essential role in cell membrane composition and intercellular communication.* It is an especially important structural component of nerve cell membranes, where it assists in the conduction of electrical impulses and facilitates the activity of neurotransmitters involved in learning, memory, and mood.*