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Phosphatidylserine (PS)
Key brain membrane phospholipid that facilitates neurotransmitter release, memory formation, and post-exercise cortisol reduction.
What the evidence says
Most Phosphatidylserine studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from high-quality randomised trials published 2008–2026 with a typical study size of 83 participants.
Based on 15 studies · 9 RCTs · 1,633 total participants
Confidence
HighWhat the studies found
By outcome
Phosphatidylserine has an evidence score of 8.5/10 — very strong evidence based on 15 indexed studies, including 5 meta-analyses. Key brain membrane phospholipid that facilitates neurotransmitter release, memory formation, and post-exercise cortisol reduction.
The commonly studied dose of Phosphatidylserine is 100-300mg daily. Research points to an estimated optimal dose around 300mg, with a minimum effective dose near 100mg. Individual response varies — start low and adjust.
The best time to take Phosphatidylserine is with meals. Take it with food. Phosphatidylserine (PS) is a phospholipid critical for neuronal membrane integrity and cell signaling.
Last reviewed May 2026 · evidence from 40 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Phosphatidylserine (PS) is a phospholipid that makes up a significant portion of brain cell membranes. It plays crucial roles in cell signaling, neurotransmitter release, and memory formation. Research shows benefits for cognitive function and cortisol reduction after exercise.
Key structural component of brain cell membranes
Reduces excessive cortisol response to stress
Facilitates acetylcholine and dopamine release
How Phosphatidylserine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Tap node to isolate • Pinch to zoom • Tap edge for research
100-300mg daily
Take with food
| Form | Type |
|---|---|
| 💊Soy or sunflower-derived phosphatidylserine | Recommended |
| 💊Sharp-PS® branded | Alternative |
| 💊Bovine-derived (rare now) | Alternative |
Soy and sunflower sources are equivalent to original bovine-derived PS. Sunflower preferred for those avoiding soy.
Minimum: 4 weeks
Optimal: 12 weeks
Cycling: Not required
Note: Better absorbed with fat. Evening dosing may support cortisol reduction. Post-workout for athletes to blunt exercise-induced cortisol.
Based on RCT in 190 Chinese older adults with mild cognitive impairment and systematic review of neuronutrients. Limited by small number of direct studies and population-specific findings.
Better recall and memory formation
Reduced stress hormone after exercise
Clearer thinking and focus
Limited data; consult healthcare provider
May be particularly beneficial for age-related cognitive decline
May help manage exercise-induced cortisol
Theoretical interaction; monitor — may affect platelet aggregation or vitamin K-dependent clotting factors, altering anticoagulant efficacy
May counteract effects
Tip: Take with food
Tip: Take earlier in day; reduce dose
Both support brain cell membrane health
Comprehensive phospholipid and fatty acid support
Both reduce cortisol through different mechanisms
Enhanced stress and cortisol management
L-serine is precursor to PS
Comprehensive cognitive support
Phosphatidylserine is generally well-tolerated and considered safe for most healthy adults at recommended doses. The most commonly reported side effects are GI upset, insomnia (at high doses). Use caution if any of these apply to you: Soy allergy (use sunflower-derived).
Rhodiola Rosea
Probably helpsFast-acting adaptogen that combats mental fatigue and improves cognitive performance under stress — works within days, not weeks.