Phosphatidylserine

Supplements · Nootropics · Supplement, Typed Supps

A brain-cell building block — modestly helpful for memory in older adults, less so for everyone else.

Stage by stage

Intake (Softgel): Fat-soluble, absorbed via the same bile-dependent route as other fats.
Small intestine (Micelle transport): Absorbed alongside dietary fat.
Bloodstream (Bound to lipoproteins): Circulates bound to lipoproteins.
Brain cell membranes (Memory & stress response): Incorporated into cell membranes, particularly in the brain, studied for memory and stress response.

What the evidence supports

Modestly improving memory in older adults with age-related decline — limited evidence. Trials at 300 mg/day showed benefit, strongest in people starting off worse. Much of the strongest data used bovine-brain-derived material that is no longer sold; plant-derived forms perform more weakly.
Blunting the cortisol rise from intense exercise — limited evidence. Supported by a few small trials; not a robust or well-replicated finding.
Improving focus in healthy young adults — insufficient evidence. The FDA permits only a qualified claim and notes very little scientific evidence supports a broad cognitive benefit.

Typical dose

100 mg three times daily (300 mg/day)

Upper limit: No established UL

Timing

With a fat-containing meal.

Time to effect

Weeks: Any reported cognitive effect in studies.

Common myth

“Phosphatidylserine supplements come from the same source studies originally used.” In reality: Early research used a form derived from cow brain tissue; most current supplements use soy- or sunflower-derived versions instead.