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“Phosphatidylserine (abbreviated Ptd-L-Ser or PS) is an important phospholipid membrane component (i.e. component of the cell membrane) which plays a key role in cell cycle signaling, specifically in relationship to apoptosis.” – Wikipedia

Phosphatidylserine seems to be a very important component to brain and cellular health.

There seems to be conflicting claims regarding PS and Hypothalamus-Pituitary-Adrenal dysfunction. Some say that it reduces cortisol output while others say that it can increase it.