What foods are high in phosphatidylserine? It is good to note that Phosphatidylserine is mostly found in the food that we eat. Some of the common Phosphatidylserine sources include; chicken heart, Atlantic mackerel, soy lecithin, cabbage, egg yolk, bovine brain, and Atlantic herring. If you are not a food enthusiast, then you could save yourself the hustle by buying Phosphatidylserine...