St John's Wort
Best-in-class: St. John's Wort
One of the few botanicals with antidepressant efficacy comparable to prescription medication in trials — and one of the most dangerous supplements in existence for drug interactions.
How St John's Wort actually works
Hyperforin inhibits reuptake of serotonin, noradrenaline and dopamine — a broad monoamine reuptake inhibition. Separately, and more consequentially, hyperforin is a potent activator of the pregnane X receptor, which induces CYP3A4 and P-glycoprotein expression. That induction is what causes the interactions, and it is a pharmacological property rather than an idiosyncrasy.
St John's Wort quick facts
| Suggested dose | 300 mg standardised extract three times daily in most trials. Give it 4–6 weeks. |
| How often | Three times daily |
| Who it's for | Mild-to-moderate low mood, in someone taking no other medication and after a proper conversation. |
✅ Clinically validated
- Cochrane and other meta-analyses show efficacy in mild-to-moderate depression comparable to standard antidepressants, with fewer side effects.
- Evidence in severe depression is weaker.
📊 Correlative data
- Long European folk use for low mood, and — unusually for a botanical — it became a first-line prescription treatment for mild-to-moderate depression in Germany, giving it real population-level exposure data.
- **That same exposure generated the interaction signal**: contraceptive failures, transplant rejections and antiretroviral failures reported in practice are how the CYP3A4 induction became widely known. Observational data found the harm the trials were too short to see.
🧪 Theoretical / extrapolated benefits
- Hyperforin inhibits reuptake of serotonin, noradrenaline and dopamine, plus other actions.
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.
Genuine efficacy in mild-to-moderate depression, established by meta-analysis. The interaction profile is why it is not first-line and it deserves stating plainly: it lowers blood levels of oral contraceptives, warfarin, immunosuppressants, antiretrovirals, some chemotherapy and many others — there are documented unplanned pregnancies and transplant rejections from this. Combined with an SSRI it risks serotonin syndrome. Never start it without checking every medication you take.
St John's Wort — safety & side effects
- Photosensitivity — real sunburn risk in fair-skinned people. Dry mouth, restlessness and GI upset.
- The single most interaction-prone botanical there is. It induces CYP3A4 and P-glycoprotein and has caused documented failures of hormonal contraception, transplant anti-rejection drugs, antiretrovirals, warfarin and some chemotherapy. *Contraceptive failure is the one that catches people.*
- Do not combine with SSRIs, SNRIs, MAOIs, triptans or tramadol without medical supervision. Serotonin syndrome is rare but it is a genuine emergency — agitation, tremor, fever, rigidity — and the risk is additive rather than threshold-based.
- Do not start it without checking every medication you take against it. This is not a cautious caveat — the failures above are real reported cases.
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 St John's Wort
Find St John's Wort on iHerb →Get the complete breakdown for St John's Wort — 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 St John's Wort — inside the Academy alongside the full interactive Vault.
Unlock in the Academy — $10/mo →Bloodwork to run alongside St John's Wort
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
St John's Wort — frequently asked questions
What is St John's Wort?
One of the few botanicals with antidepressant efficacy comparable to prescription medication in trials — and one of the most dangerous supplements in existence for drug interactions.
What is the suggested dose of St John's Wort?
300 mg standardised extract three times daily in most trials. Give it 4–6 weeks. 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 St John's Wort 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 St John's Wort?
Coach Cam sources St John's Wort from vetted, top-rated brands on iHerb — 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 St John's Wort is used for
St John's Wort appears under 1 goal 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.