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Phosphatidylserine

Evidence Fact Sheet

PS · soy/sunflower-derived

Phosphatidylserine (PS) is a neuronal cell-membrane phospholipid (soy/sunflower-derived in supplements) studied for cognitive, memory, ADHD-attention and HPA-axis cortisol endpoints. Research typically uses 100-300 mg/day oral PS for cognition (up to 800 mg/day in cortisol studies). Permitted supplement ingredient in US/EU/CN/BR; FDA carries only a Qualified Health Claim, no EFSA-authorized claim.

Also known as: Phosphatidylserine · PS · Soy-PS · Sunflower-PS · PtdSer

Overview

Phosphatidylserine (PS) is an inner-leaflet phospholipid of neuronal cell membranes that helps maintain membrane fluidity and integrity and supports cholinergic (acetylcholine) signaling; human challenge data also link it to modulation of the HPA-axis cortisol/ACTH stress response. Commercial PS is derived from soy or sunflower lecithin (soy-PS must declare the soy allergen). Research describes oral doses of roughly 100-300 mg/day over 6-12 weeks in cognition/memory contexts, with higher 300-800 mg/day ranges used in exercise/cortisol studies. Regulatory status is "permitted ingredient, limited claims": the US allows only a Qualified Health Claim (with a mandatory disclaimer that the evidence is very limited and preliminary), and the EU (EFSA), Brazil (ANVISA) and China have no authorized standalone functional health claim. The evidence base is small and mixed, and the strongest positive cortisol data come from brain-cortex-derived (not the oral plant) PS.

Mechanism of Action

Neuronal cell-membrane phospholipid — maintains membrane fluidity and integrity (research-context mechanism) · Supports presynaptic acetylcholine release and cholinergic signaling (preclinical / mechanistic) · Modulation of the HPA-axis cortisol/ACTH stress response (human IV BC-PS challenge data) · Inner-leaflet membrane phospholipid involved in neuronal signal transduction

Body systems: Neurological & Cognitive · Mood & Stress Response · Musculoskeletal

Evidence-Based Benefits

Each benefit below is anchored to a specific PubMed-indexed study. Effect sizes, sample sizes, and p-values are reported as published; no values are inferred. Honest negatives and null results are kept alongside the positive findings, and disease-research populations are described as such — Phosphatidylserine is not characterized as a treatment for any disease.

Pediatric ADHD Symptoms & Short-Term Memory

RCT supported
  • 36 childrenrandomized · pure soy-PS
  • 200 mg/daydose · 2 months
  • P < 0.01ADHD symptom improvement

In a randomized, double-blind, placebo-controlled trial, 36 children given 200 mg/day of pure soy-derived phosphatidylserine for 2 months showed significant improvements in ADHD symptom scores and short-term auditory memory versus placebo. This is one of the few trials using PS as a single ingredient rather than a PS-omega-3 combination.

Reported effect: Significant improvements in ADHD (P < 0.01), AD (P < 0.01) and HD (P < 0.01); short-term auditory memory (P < 0.05); inattention and impulsivity (P < 0.05); 200 mg/day for 2 months in 36 children (19 PS, 17 placebo)

“PS supplementation resulted in significant improvements in: (i) ADHD (P < 0.01), AD (P < 0.01) and HD (P < 0.01); (ii) short-term auditory memory (P < 0.05) ... inattention and impulsivity (P < 0.05)”

Source: PMID 23495677 · Hirayama 2014 · J Hum Nutr Diet

Memory in Non-Demented Elderly (PS + Omega-3)

RCT supported

A randomized, placebo-controlled trial of a phosphatidylserine plus DHA preparation in non-demented elderly (157 randomized, 122 completing the efficacy analysis over 15 weeks) reported significantly improved verbal immediate recall versus placebo. Note this tested a PS-omega-3 combination, not PS alone, and the abstract reports the direction but no numeric effect size.

Effect size: this study reports the direction of the finding but does not state a specific numeric effect size, so none is given here rather than estimated.

“At endpoint, verbal immediate recall was significantly improved in the PS-DHA group compared to the placebo group.”

Source: PMID 20523044 · Vakhapova 2010 · Dement Geriatr Cogn Disord

Cognition in Age-Associated Impairment (Brain-Cortex PS)

RCT supported

An early double-blind trial in 51 patients given bovine-cortex-derived phosphatidylserine 100 mg three times daily for 12 weeks found improvement on several cognitive measures relative to placebo, most apparent in those with less severe impairment. The abstract reports the direction of effect but no numeric effect size, and this used brain-cortex (not the modern plant-derived) PS.

Effect size: this study reports the direction of the finding but does not state a specific numeric effect size, so none is given here rather than estimated.

“those treated with the drug improved on several cognitive measures relative to those administered placebo ... Differences between treatment groups were most apparent among patients with less severe cognitive impairment.”

Source: PMID 1609044

HPA-Axis Cortisol / ACTH Stress Response (Brain-Cortex PS)

RCT supported
  • 800 mg/day10 days · 9 men
  • P = 0.003ACTH blunting
  • P = 0.03cortisol blunting

In 9 healthy men, brain-cortex-derived phosphatidylserine at 800 mg/day for 10 days significantly blunted the ACTH and cortisol responses to physical exercise compared with placebo. This is the cleanest positive HPA-axis signal, but it used brain-cortex PS rather than the oral plant-derived supplement and a very small sample.

Reported effect: Phosphatidylserine 800 mg/d for 10 days significantly blunted the ACTH and cortisol responses to physical exercise (P = 0.003 and P = 0.03, respectively); 9 healthy men

“Phosphatidylserine 800 mg/d for 10 days significantly blunted the ACTH and cortisol responses to physical exercise (P = 0.003 and P = 0.03, respectively)”

Source: PMID 1325348 · Monteleone 1992 · Eur J Clin Pharmacol

Exercise Cortisol & Muscle-Damage Recovery (Oral Soy-PS) — Honest Negative

Null / no benefit RCT supported
  • 16 playersoral soy-PS
  • 750 mg/day10 days · null

In 16 male soccer players, 750 mg/day of oral soybean-derived phosphatidylserine for 10 days did NOT attenuate the cortisol response, perceived soreness, or markers of muscle damage and lipid peroxidation after exhaustive running. This is a key honest negative: the popular cortisol/recovery framing is not supported for the oral plant-source supplement.

Reported effect: Serum cortisol, perceived soreness, creatine kinase, myoglobin and lipid peroxidation were elevated to an equal extent in PS and placebo following exhaustive exercise; 750 mg/day for 10 days in 16 male soccer players — no significant benefit

“Supplementation with phosphatidylserine was not effective in attenuating the cortisol response, perceived soreness, and markers of muscle damage and lipid peroxidation following exhaustive running.”

Source: PMID 16118575 · Kingsley 2005 · Med Sci Sports Exerc

Dosage (research context · not a recommendation)

Educational reference, not a dosing recommendation. Research describes 100-300 mg/day of oral soy/sunflower-derived PS over 6-12 weeks in the cognitive/memory context (pediatric ADHD RCT used 200 mg/day); higher 300-800 mg/day ranges appear in exercise/cortisol studies (mostly null on the stress endpoint). Common commercial unit strengths are 100-200 mg.

Regulatory Status · 4 Markets

US · FDA
Legal dietary-supplement ingredient under DSHEA (GRAS self-affirmed, soy/sunflower lecithin source). FDA issued a 2003 Qualified Health Claim (QHC) on phosphatidylserine and cognitive dysfunction / dementia risk in the elderly — but it is a QUALIFIED claim carrying mandatory FDA disclaimer language stating the scientific evidence is very limited and preliminary; the regulator-templated wording must be used unaltered and is NOT a strong/unqualified health claim. The verbatim QHC wording is regulator-fixed and not reproduced here.
EU · EFSA
Authorized as a Novel Food / permitted food-supplement ingredient in the EU; 0 EFSA-authorized health claim (Reg 432/2012) — Art.13/14 cognitive claims for phosphatidylserine were not approved.
CN · China
Soybean phosphatidylserine approved as China novel food ingredient (MOH 2010 No.15 + equivalence extension); used in health-food products; no standalone SAMR function.
BR · ANVISA
Permitted as a food-supplement (suplemento alimentar) constituent under the RDC 243/2018 framework; no authorized IN 28/2018 alegação funcional for phosphatidylserine.

Safety

Generally well tolerated at 100-800 mg/day in trials; uncommon mild GI upset. Soy-derived PS products must declare the soy allergen (sunflower-derived PS avoids this). No adequate pregnancy/lactation data. Evidence base is small and mixed: the cleanest positive HPA/cortisol data come from INTRAVENOUS brain-cortex-derived PS (not the oral plant-source supplement), and the oral soy-PS sports RCT (Kingsley 2005) was largely NULL on cortisol — so cortisol-recovery framing is not well supported. Evidence grade B: pure-PS human RCT >=1 (Monteleone 1990 IV positive · Hirayama 2014 oral positive), but direct single-ingredient meta-analysis / systematic review count = 0 -> NOT grade A.

Goals: cognitive-support

Lifestyles: senior-60-plus

References

PubMed-indexed citations anchoring the benefit findings above. Effect sizes are reported as published.

  1. PMID 23495677 · Hirayama 2014 · J Hum Nutr Diet — Pediatric ADHD Symptoms & Short-Term Memory
  2. PMID 20523044 · Vakhapova 2010 · Dement Geriatr Cogn Disord — Memory in Non-Demented Elderly (PS + Omega-3)
  3. PMID 1609044 — Cognition in Age-Associated Impairment (Brain-Cortex PS)
  4. PMID 1325348 · Monteleone 1992 · Eur J Clin Pharmacol — HPA-Axis Cortisol / ACTH Stress Response (Brain-Cortex PS)
  5. PMID 16118575 · Kingsley 2005 · Med Sci Sports Exerc — Exercise Cortisol & Muscle-Damage Recovery (Oral Soy-PS) — Honest Negative

Frequently Asked Questions

1. What is phosphatidylserine and where does supplement PS come from?

Phosphatidylserine (PS) is a phospholipid found in the inner leaflet of neuronal cell membranes, where it helps maintain membrane fluidity and supports cholinergic (acetylcholine) signaling. Most modern supplements are derived from soy or sunflower lecithin; older clinical studies often used brain-cortex-derived PS. Soy-derived PS products must declare the soy allergen, while sunflower-derived PS avoids it.

2. What does the human evidence actually show for cognition and ADHD?

It is a small, mixed evidence base rather than definitive proof. A randomized trial of pure soy-PS at 200 mg/day in 36 children reported significant ADHD-symptom and short-term-memory improvements (P < 0.01 for ADHD scores; PMID 23495677). PS-plus-DHA combinations have shown improved verbal recall in non-demented elderly (PMID 20523044), and early bovine-cortex PS improved cognitive measures in age-associated impairment (PMID 1609044). Several positive studies tested PS combined with omega-3s rather than PS alone.

3. Does phosphatidylserine lower cortisol or speed exercise recovery?

The signal is split by PS source. Brain-cortex-derived PS at 800 mg/day blunted exercise-induced ACTH and cortisol in 9 healthy men (P = 0.003 and P = 0.03; PMID 1325348). But oral soybean-derived PS at 750 mg/day did NOT attenuate cortisol, soreness, or muscle-damage markers after exhaustive running in 16 players (PMID 16118575). So the cortisol/recovery framing is not well supported for the oral plant-source supplement many products use.

4. What is the regulatory status of phosphatidylserine?

PS is a permitted supplement ingredient in the US, EU, China and Brazil. In the US the FDA allows only a Qualified Health Claim on PS and cognitive dysfunction/dementia risk in the elderly, carrying a mandatory disclaimer that the scientific evidence is very limited and preliminary — it is not a strong, unqualified claim. The EU (EFSA), Brazil (ANVISA) and China have no authorized standalone functional health claim for PS. This page reports research findings in studied populations and is not medical or dosing guidance.

Last evidence review: 2026-06-13

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