What is phosphatidylserine and why does the source matter?

Phosphatidylserine (PS) is a phospholipid found in high concentrations in brain cell membranes. It supports cell signaling and neurotransmitter activity. Studies report that soy-derived PS has the broadest evidence base for cognitive support, while sunflower-derived PS is an alternative for those avoiding soy.

What dose does research use?

Published trials typically use 100–300 mg of PS per day, often in divided doses. A 6-month study in older adults used 100–300 mg/day and found significant improvements in delayed verbal recall (PMID 21103034). Studies suggest meaningful effects may appear after several weeks of consistent use.

Is bovine-derived PS the same as soy-derived PS?

Early research used bovine cortex-derived PS. Regulatory restrictions on bovine brain materials led to a shift to plant-based sources. Most current controlled-trial evidence uses soy-derived PS; the two forms have similar fatty acid profiles and are generally considered equivalent, though direct head-to-head studies are limited.

Can phosphatidylserine be taken with other cognitive supplements?

PS is commonly combined with other cognitive-support nutrients. Formulas combining PS with additional phospholipids have been studied; consult a healthcare provider before combining supplements, particularly if you take blood-thinning medications.

Best Phosphatidylserine Form: Which Should You Take?

Soy-derived phosphatidylserine is the form studied in most published cognitive-support trials, with studies reporting improvements in verbal memory and daily functioning.

Updated 2026 · Reviewed by Dr. Brennan Commerford, D.C.

All Forms Ranked by Evidence

1
100/ 100· Top TierBest by EvidenceFF Preferred
Phosphatidylserine
Form: Soy-Derived
—
Verification pending
SerinAid® (Phosphatidylserine 50%)
Form: SerinAid®
SerinAid® (Phosphatidylserine 50%) — SerinAid® (Phosphatidylserine 50%) is one form of this compound. Limited direct human-PK evidence for this specific form. We grade forms only where form-specific human pharmacokinetic evidence exists; this form does not yet meet that bar, so we do not assign it a benefit rating.

Editorial note

The majority of published double-blind RCTs use soy lecithin-derived phosphatidylserine. A 6-month RCT (n=78) found soy-PS significantly improved delayed verbal recall vs placebo in older adults with memory complaints (PMID 21103034). A further RCT series showed soy-derived PS stabilized daily functioning in Alzheimer's patients vs placebo (PMID 25414047).

All Forms Compared

Soy-Derived

Best For

Memory support, cognitive aging, stress response

Most extensively studied form. Studies report serum PS peaked 90 min after soy-derived PS ingestion and significant memory improvements in older adults at 100–300 mg/day (PMID 21103034, PMID 25414047).

SerinAid®

Best For

Standardized dosing, cognitive support

SerinAid® is a branded concentration of soy-derived PS used in clinical studies. Bioavailability is comparable to unbranded soy PS; some studies use this form specifically.

Frequently Asked Questions

What is phosphatidylserine and why does the source matter?: Phosphatidylserine (PS) is a phospholipid found in high concentrations in brain cell membranes. It supports cell signaling and neurotransmitter activity. Studies report that soy-derived PS has the broadest evidence base for cognitive support, while sunflower-derived PS is an alternative for those avoiding soy.
What dose does research use?: Published trials typically use 100–300 mg of PS per day, often in divided doses. A 6-month study in older adults used 100–300 mg/day and found significant improvements in delayed verbal recall (PMID 21103034). Studies suggest meaningful effects may appear after several weeks of consistent use.
Is bovine-derived PS the same as soy-derived PS?: Early research used bovine cortex-derived PS. Regulatory restrictions on bovine brain materials led to a shift to plant-based sources. Most current controlled-trial evidence uses soy-derived PS; the two forms have similar fatty acid profiles and are generally considered equivalent, though direct head-to-head studies are limited.
Can phosphatidylserine be taken with other cognitive supplements?: PS is commonly combined with other cognitive-support nutrients. Formulas combining PS with additional phospholipids have been studied; consult a healthcare provider before combining supplements, particularly if you take blood-thinning medications.

Ready to formulate with Soy-Derived?

Build your personalized formula with research-backed dosing.

Start My Formula

Deep dive: Soy-Derived research

Full ingredient spotlight with citations

View spotlight

FormulaForge formulates and sells supplements containing the ingredients discussed on this page. Our formulary recommendations are based on peer-reviewed bioavailability research. All cited studies are independently verifiable.