Compound Profile

Phosphatidylserine

Phosphatidylserine carries a Grade B rating — moderate evidence.

Last reviewed: June 6, 2026•4 sources citedReport a correctionProfile-wide ·B Moderate

Use extra caution — Generally safe Details

Evidence: Moderate evidence
Typical onset: Varies by prep
Safety rating: Use extra caution: Generally well tolerated
Best for: Cognitive Support, Cortisol Reduction, Neuroprotective
Avoid / review if: Anticoagulants (Theoretical)

Verdict: PhosphatidylserineMaybe

Bottom line

Phosphatidylserine has older trials for memory and some data on blunting stress cortisol — a plausible, low-risk option, though much of the best evidence used formulations no longer common.

Evidence confidence: Limited–moderate — older cognition trials plus some cortisol data
Expected onset: Weeks
Give it: 6–12 weeks

Safety: Generally well tolerated; discuss with a clinician if you take blood thinners.

On the evidence: Some cognition and cortisol trials, several older and small; soy-derived differs from earlier bovine sources.

Best for

Stress-related cortisol
Cognitive support with aging
Exercise-stress recovery

Not ideal for

Acute anxiety
Same-day focus
Young, healthy users expecting large gains

Consider instead: Ashwagandha — for the best-studied cortisol/stress option

How strong is the evidence?Limited–moderate

Why not higher

Much of the strongest data is older and used different source material
Modern soy-derived trials are smaller
Effects are modest

Why not lower

Multiple trials support memory and stress-cortisol benefits
A clear role in cell-membrane and neuronal function

Practical takeaway: A reasonable, low-risk trial for stress-cortisol or age-related cognition over 6–12 weeks. Not a fast focus tool.

Next stepsWhere to go next — guides & comparisons

Start here

New to this? Begin with Best nootropics for focus.

If you want help with anxiety or stress → Anxiety & stress guides
If you want sharper focus → Focus guides
If you want to browse more compounds → All compounds

Generated profile category visual

Safety

Safety & Cautions

Generally safe

Elevated caution

Caution level: Elevated. One caution category applies — read it before use.

Hormonal Activity ContextHormone-adjacent wording is present and should be interpreted carefully.

Evidence-based safety

Caution when combined

Severity and certainty are shown separately. A high-priority caution can still be theoretical: these pairings are screened from shared contraindication mechanisms and are not automatically documented clinical interactions. Provenance identifies the source fields that produced each flag; it does not upgrade the certainty of the pairwise claim.

High-Priority Caution

147 flagged pairings

Bleeding / anticoagulant risk

Representative pairings are shown below. Large mechanism groups are intentionally summarized to keep profiles focused and crawl-efficient.

Bleeding / anticoagulant riskCertainty: Theoretical

Data provenance recorded for 147 of 147 pairings in this mechanism group.

+135 more pairings share this mechanism. Use the Safety Checker to review a specific combination.

Evidence Summary

Profile-wide ·B Moderate

Evidence lens

Useful signal, but study design, dose, and population still matter.

ModerateModerate evidence

Human clinical evidence: Present in source signals

Mechanistic / preclinical: Mechanism mapped — Cellular Protection · Hormonal Signaling Context · Stress Response Modulation

Research maturity: Established research — main contexts: Cognitive Support · Cortisol Reduction · Neuroprotective

Safety boundary: Safety note available — Generally safe

This profile cites 4 human studies.

Evidence Strength

Confidence estimate based on the design quality and consistency of published clinical trials.

Moderate evidence

Phosphatidylserine has a moderate evidence rating.

AdaptogenStress & Mood

Citation density

1.0

Sources

Effects

Research recency

Mixed recency

Evidence Grade

Grade B: Moderate Evidence

Evaluation of methodological rigor, population reach, and evidence alignment.

Design Match: Systematic review
Risk of Bias: Low
Consistency: Consistent

Strongest recorded design is a systematic review, drawn from 4 recorded studies, 4 in people. No disagreement is recorded across them.

How evidence grades work

Each grade reflects the strength and consistency of published human evidence — not marketing claims. Grades are based on study count, design quality, effect size, consistency, and recency.

Strong: Multiple RCTs, consistent direction, adequate effect size
Moderate: Some RCTs or consistent observational data in humans
Preliminary / Mixed: Animal or in-vitro only, or conflicting human data
Traditional / Theoretical: Traditional use only; no controlled human trials

Clinical Study Summaries (3)3 human evidence sources · 2 human trials · Participant totals not consistently reported · Consistency not yet classifiable

Filter by study class

Showing 3 of 3 studies.

What the evidence actually shows

This table contains 3 structured sources, including 3 human evidence sources; 2 are human trials.

Study	Design	N	Dose	Duration	Population	Outcome	Result & magnitude	Source
A recent review covering phosphatidylserine and citicoline includes controlled ADHD and adult studies, but ingredient, age, formulation, and outcome differences prevent a single pooled nootropic conclusion. Background	Systematic review Uses a predefined method to find and evaluate relevant studies, but may or may not pool their results statistically.	—	—	—	—	—	A recent review covering phosphatidylserine and citicoline includes controlled ADHD and adult studies, but ingredient, age, formulation, and outcome differences prevent a single pooled nootropic conclusion.	PubMed →
A randomized placebo-controlled study in chronically stressed men found that a soy-based phosphatidylserine/phosphatidic-acid complex altered hypothalamic-pituitary-adrenal-axis stress reactivity. Background	Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well.	—	—	—	—	—	A randomized placebo-controlled study in chronically stressed men found that a soy-based phosphatidylserine/phosphatidic-acid complex altered hypothalamic-pituitary-adrenal-axis stress reactivity.	PubMed →
Systematic evidence for phosphatidylserine is limited and concentrated in age-related cognitive complaints rather than healthy young adults. Selected cognitive signals should remain population- and formulation-specific. Background	Randomized controlled trial Randomly assigns participants to interventions or controls, reducing many sources of bias when the trial is conducted well.	—	—	—	—	—	Systematic evidence for phosphatidylserine is limited and concentrated in age-related cognitive complaints rather than healthy young adults. Selected cognitive signals should remain population- and formulation-specific.	PubMed →

How Phosphatidylserine Works

Simplified mechanism pathway based on preclinical and pharmacological evidence. Does not confirm clinical efficacy.

Mechanism Pathway — How Phosphatidylserine Works

CompoundTarget / ReceptorMechanismEffect / Outcome

Dosing

Dose guidance: 100 300 mg/day

Mechanisms & biological pathways

Preclinical mechanism details from scientific profiles; these represent plausible pathways but do not guarantee clinical efficacy in humans.

Cellular Protection
Hormonal Signaling Context
Stress Response Modulation
Neuroprotective Activity
Lipid Metabolism

Compare & Sourcing

Compare side-by-side tradeoffs or verify active marker guidelines.

Review available sources for Phosphatidylserine

Independent database mapping — evaluated separately from safety and efficacy scores.

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Safety first · Harm reduction

This information is educational and not medical advice. Start low, avoid risky combinations, and consult a licensed clinician before making health decisions—especially if you use medications, have diagnosed conditions, or are pregnant/breastfeeding.

Learn how we evaluate confidence, safety, and intensity on the methodology page.

By Willie B. Randolph III

Founder & Head Researcher · Oak Ridge, TN · Last reviewed August 2026

Editorial Review

Checked against primary sources, cited evidence, and contraindication language before publication. Evidence claims, safety language, and affiliate modules are reviewed independently. Not personal medical advice.

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