What foods are the best source for phosphatidylserine?

Phosphatidylserine is primarily found in high amounts in soy products, such as soy lecithin, and in animal-based foods like organ meats, particularly beef liver. Other good sources include fish, especially mackerel and salmon, as well as white beans and egg yolks. While dietary intake can contribute to phosphatidylserine levels, supplements are also available for those looking to increase their intake.