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. Soy-derived PS has limited, preliminary human evidence, and sunflower-derived PS is an alternative for those avoiding soy.

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. Whether soy-derived and bovine-derived PS are equivalent has not been established in head-to-head studies.

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?

We rank soy-derived phosphatidylserine first as a catalog choice, not as a ranking by strength of evidence; its human evidence is limited and largely preliminary.

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

We rank soy-derived PS first; that is a catalog choice, not a ranking by strength of evidence. For soy-derived PS, in a 6-month RCT (n=78) in older adults with memory complaints, memory scores rose similarly in all groups including placebo; only in a low-baseline subgroup did soy-PS memory scores, chiefly delayed verbal recall, rise from baseline while placebo stayed unchanged (PMID 21103034). Other published soy-PS trials combined PS with phosphatidic acid (PMID 25414047), so their results cannot be attributed to PS alone. This is a single-study subgroup finding, and we believe it needs further study and verification.

All Forms Compared

Soy-Derived

Best For

Soy-derived PS; human memory evidence is limited and preliminary

Serum PS peaked about 90 min after a single dose of a soy-PS plus phosphatidic-acid blend in healthy volunteers (PMID 25414047). In a 6-month RCT at 100–300 mg/day in older adults with memory complaints, scores rose similarly in all groups, including placebo; only in a low-baseline subgroup did PS-group scores rise from baseline while placebo stayed unchanged — a within-group change, not a difference versus placebo (PMID 21103034). This is a single study, and we believe it needs further study and verification.

SerinAid®

Best For

Branded soy-derived PS; human memory evidence is limited and preliminary

SerinAid® is a branded soy-derived PS concentrate. We have not found published trials that used it specifically or compared its absorption with unbranded soy PS.

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. Soy-derived PS has limited, preliminary human evidence, and 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. In a 6-month study in older adults (100–300 mg/day), scores rose similarly in all groups including placebo; only in a low-baseline subgroup did PS-group scores rise from baseline while placebo stayed unchanged (PMID 21103034).
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. Whether soy-derived and bovine-derived PS are equivalent has not been established in head-to-head studies.
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.