NOW® Phosphatidyl Serine is a phospholipid compound derived from soy lecithin that plays an essential role in cell membrane composition & intercellular communication. Phosphatidyl Serine is a major structural component of neural membranes where it asists in the conduction of electrical impulses & facilitates the activity of neurotransmittters involved in learning, memory & mood. These properties make NOW® Phosphatidyl Serine an ideal supplement for the support of cognitive function.* Do Not Eat Freshness Packet. Keep in Bottle. As a dietary supplement, take one Vcap® 1 to 3 times daily, preferably with meals. Consider taking this product in combination with NOW® Ginkgo Biloba & DMAE. Cellulose, Cellulose (capsule) and Silica.