Every Doctor's Best supplement is a scientifically based formula that is made of high quality raw materials on the market. Each product is clinically-tested before it’s offered for sale. If you are looking for good supplements at good price, Doctor's Best products are the supplements that you need. Doctor's Best Best Phosphatidyl Serine provides the essential brain nutrient phosphatidylserine in a matrix of other phospholipids are structural components of brain neurons than can enhance cell-to-cell communication. It supports healthy memory and thinking ability by facilitating neuronal communication. Doctor's Best Best Phosphatidyl Serine also provides building blocks for healthy neurons. Best Phosphatidylserine contains phosphatidylserine and other essential nutritional cofactors in a liquid softgel, providing added stability to these key phospholipid molecules.