Phosphatidylserine
Best-in-class: Iso-Phos
A key brain-cell-membrane phospholipid that supports memory, focus and — notably — blunts exercise- and stress-induced cortisol spikes.
How Phosphatidylserine actually works
A membrane phospholipid concentrated on the inner leaflet of neuronal membranes, where it supports receptor function and vesicle release. Its distinctive effect is on the HPA axis: supplementation blunts the cortisol response to acute stress, apparently by dampening ACTH release, which is a mechanism no other phospholipid shares.
Phosphatidylserine quick facts
| Suggested dose | 100 mg 1–3× daily; useful post-training or in the evening to lower cortisol. |
| How often | daily |
| Who it's for | Cognitive support and cortisol/stress management (great for hard trainers). |
✅ Clinically validated
- RCTs show improved memory/attention in age-related decline.
- Reduces cortisol response to intense exercise and acute stress in trials.
📊 Correlative data
- Declining membrane phospholipids track with cognitive aging.
🧪 Theoretical / extrapolated benefits
- Broad neuroprotective roles follow from its membrane function but are still being defined.
These tiers tell you how much human evidence exists — not how well something works. This is the research space, and most of what’s in here is new rather than disproven. Something sitting at “theoretical” usually means nobody has funded the trial, not that the trial was run and failed.
The trap runs the other way too: something can be clinically validated and still do very little for you specifically. A statistically significant result in a study population is not a promise about your body.
- ✅ Clinically validated — human randomised trials or meta-analyses support it. The strongest footing available.
- 📊 Correlative — observational or epidemiological data. Suggestive, and genuinely useful for direction, but it cannot establish cause.
- 🧪 Theoretical / mechanistic — the mechanism is understood and often demonstrated in cells or animals, and the human trial doesn’t exist yet. Unproven is not the same as ineffective. Plenty of what’s standard practice today sat here five years ago.
✗ is a safety flag, not a grade. Where you see it, the concern is harm — not a disappointing trial. A compound tested for one purpose and found not to help there can still be worth studying somewhere else, so a negative result never gets rendered as a cross. It sits alongside the tier, because something can be both well-studied and genuinely risky.
My job is to tell you which one you’re looking at, and let you make the call. Grading something low isn’t me dismissing it — it’s me refusing to oversell it. This is the research space, and being able to reason forward from a mechanism matters as much as waiting for the trial.
Dose it around the stressor rather than daily — the cortisol-blunting effect is acute, which makes it well suited to the evening cortisol spike that keeps people wired at 11pm. Trial evidence covers memory in age-related decline and the stress response separately. Modern products are soy or sunflower derived; the older bovine-derived trials used a slightly different phospholipid profile.
Phosphatidylserine — safety & side effects
- Insomnia and GI upset, mainly at doses above 300 mg or taken late.
- It blunts the cortisol response — useful around training, and a reason to be careful if you are already on corticosteroids or have low cortisol.
- Additive bleeding risk with anticoagulants and antiplatelets — warfarin, apixaban, rivaroxaban, clopidogrel, and aspirin at any dose. The interaction is pharmacodynamic rather than metabolic, so it does not show up as a changed drug level; it shows up as bruising, nosebleeds or a raised INR. Modern products are soy- or sunflower-derived rather than bovine, which removed the historical prion concern entirely.
Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.
Where to get Phosphatidylserine
Buy Iso-Phos at Thorne →Get the complete breakdown for Phosphatidylserine — inside the Academy alongside the full interactive Vault.
Unlock in the Academy — $10/mo →- When to take it, and what to take it with
- Which form actually absorbs
- Who it's worth it for
- Best-in-class brand pick
- Coach Cam's stacks and notes
Get the complete breakdown for Phosphatidylserine — inside the Academy alongside the full interactive Vault.
Unlock in the Academy — $10/mo →Bloodwork to run alongside Phosphatidylserine
Run these before you start, and again after 8–12 weeks. A baseline you didn’t take is one you can never go back for.
| Marker | What it’s watching for |
|---|---|
| TSH (Thyroid-Stimulating Hormone) | Thyroid disease imitates every cognitive complaint there is |
| Vitamin B12 | Deficiency causes fog long before it causes anaemia |
| Methylmalonic Acid (MMA) | Catches the deficiency a normal B12 hides |
| Ferritin | Low iron flattens cognition at levels most labs call fine |
| Vitamin D (25-Hydroxy) | Commonly low, cheap to correct, associated with mood |
The Brain Fog & Cognition panel covers these in one order — 12 markers, $233.06 with the discount applied.
Check results you already have → · All 102 markers A–Z
Phosphatidylserine — frequently asked questions
What is Phosphatidylserine?
A key brain-cell-membrane phospholipid that supports memory, focus and — notably — blunts exercise- and stress-induced cortisol spikes.
What is the suggested dose of Phosphatidylserine?
100 mg 1–3× daily; useful post-training or in the evening to lower cortisol. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.
Where can I find Phosphatidylserine dosing and the full breakdown?
The suggested dose and the full evidence — clinical, correlative and theoretical — are on this page. What's inside the Academy is when to take it, which form actually absorbs, the brand worth buying and Coach Cam's stacks.
Where can I buy Phosphatidylserine?
Coach Cam sources Phosphatidylserine from Thorne, with 10% off auto-applied at checkout — use the buy link on this page.
Build your foundation with Coach Cam
The full Supplement Vault — 350 products across 14 categories with clinical, correlative & theoretical evidence, plus my Thorne partner links — lives inside the Academy alongside 237 peptides.
Join the Academy — $10/mo →What Phosphatidylserine is used for
Phosphatidylserine appears under 5 goals in the Vault’s goal router, grouped by the mechanism it works through rather than by how much trial evidence exists. Each link opens that pathway in full, with the alternatives beside it and the bloodwork that tests it.