Doctor's Best Natural Brain Enhancers contains GlyceroPhosphoCholine (GPC) from AlphaSize and PhosphatidylSerine (PS) from SerinAid. 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.