Phosphatidylserine is a chemical that is essential for many functions in the human body, especially the brain. Most foods contain small amounts of phosphatidylserine.

Phosphatidylserine is part of the structure of the body's cells. The body can make phosphatidylserine, but most of the phosphatidylserine it needs comes from food. Phosphatidylserine can also be taken as a supplement. These supplements were once made from cow brains. Now they are usually made from cabbage or soy.

Phosphatidylserine is used to treat Alzheimer's disease and normal age-related decline in memory and thinking skills. It is also used to improve athletic performance, ADHD, and many other uses, but there is no good scientific evidence to support these uses.