Phosphatidylserine is a very underrated and underutilized supplement. PS is commonly used for nootropic purposes, and especially for stress purposes.

PS has been studied and shown to be effective for cortisol reduction. If you’re not sure what cortisol is and how it may be affecting your progress, check out our article on it here. It also has a study showing it to be beneficial for increasing endurance in cyclists. What makes these studies more promising than many other ingredients out there is that the studies on PS have been done on humans.

As for nootropic purposes, PS has been shown to be beneficial for improving memory function. There are multiple studies showing PS to be beneficial, but they have been done on the elderly.

You’ll usually see PS as a standalone, although you may be able to find it paired with ingredients such as Alpha-GPC, Huperzine A, L-Tyrosine, and Omega-3 supplements.

You may find PS paired with other stress reducing supplements such as L-Theanine, Rhodiola Rosea, and Ashwagandha. 

Side effects may include insomnia and upset stomach.

PS should be dosed around 400mg per day for cognition benefits. For cortisol reduction, 800mg per day has been shown to be effective. This dose may be split or taken all at once.

The following products contain Phosphatidylserine at the recommended dosage, and are recommended supplements for Fitness Informant: