Klaire Labs Phosphatidyl Serine SF Soy free source from sunflower formula. Supports brain and nerve function. Phosphatidylserine is the most abundant phospholipid in the human brain and is made by the body in small amounts. It supports neuronal cell integrity by providing the building blocks needed for cell membrane structure and function. Cell membranes not only act as a barrier between the inside and outside of a cell, but also play an important role in cellular communication and normal cellular responses. Phosphatidylserine has also been documented to increase the availability of choline for synthesis of acetylcholine, an important neurotransmitter involved in memory and learning. It also helps enhance cognitive function by maintaining cholinergic activity in the brain. Recommended Use: 1 capsule, 1 to 2 times daily with food or as directed by a healthcare professional.