Doctor?s Best Natural Brain Enhancers contains GlyceroPhosphoCholine (GPC) from AlphaSize and PhosphatidylSerine (PS) from SerinaAid. Both are phospholipid nutrients intensively researched for their benefits to diverse human brain functions.* These nutrients naturally complement each other: GPC reaches very high concentrations inside cells while PS is a part of the cell structure and is key in the maintenance of cellular function specially in the brain where it generates the brain?s energy and electricity.* Studies have shown that GPC and PS support memory learning and other cognitive functions. PS may also help body in coping with occasional stress.* At Doctor?s Best we lead with science. Our products are backed by research and crafted using pure ingredients carefully sourced from around the globe. Since 1990 we have dedicated ourselves to providing highly effective nutritional supplements that enable you to live a healthier lifestyle. We want nothing more than to see you and your family thrive!