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.

Moderate Evidence

Best Form of Phosphatidylserine

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

—
Verification pendingFF Preferred
Phosphatidylserine
Form: Soy-Derived
Evidence for this form is under review — no score is shown until it is verified.
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Verification pending
SerinAid® (Phosphatidylserine 50%)
Form: SerinAid®
Evidence for this form is under review — no score is shown until it is verified.

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.

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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.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.