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NOW Phosphatidyl Serine - Extra Strength is an ideal supplement for the support of cognitive function.* Phosphatidyl Serine is a phospholipid compound derived from soy lecithin that plays an essential role in cell membrane composition and intercellular communication. Phosphatidyl Serine is a major structural component of neural membranes where it assists in the conduction of electrical impulses and facilitates the activity of neurotransmitters involved in learning, memory and mood.