Dosage · Supplement
St. John's Wort: dosage and how to take it
300 mg standardized ×3/day — audit all meds first.
- Overall grade
- Grade B
- Last revised
- 0
- graded outcomes
- 0
- references listed
Assembled by the app from other entries in this library. It adds no evidence of its own — follow the links to the entries it draws on.
The evidence in words
How much to take
300 mg of a standardized extract three times daily is the trial dose — but only after auditing every medication you take with a pharmacist. It is not a casual add-on.
Timing & separation
There are no strict timing conflicts on record for St. John's Wort; consistency matters more than the exact hour for most goals.
Why the dose is what it is
It inhibits reuptake of serotonin, norepinephrine, and dopamine (an SSRI-like action) — and, critically, hyperforin potently induces the CYP3A4 enzyme and P-glycoprotein transporter, accelerating the breakdown of a huge range of medications.
Bottom line
Effective for mild-to-moderate depression, and the supplement most likely to sabotage your other medications. Only under professional guidance with a full drug review — never alongside antidepressants or the pill.
How it is used
As the entry records it, from the studies it summarises. Not a recommendation for you — doses that suit a trial population may not suit you.
- Trial dose
- 300 mg standardized ×3/day — audit all meds first.
Goes with
- St. John's WortFull St. John's Wort monographEvidence grade B
Related reading
Entries that share this one's tags or conditions.
- Saffron: dosage and how to take it30 mg/day standardized (15 mg ×2).Evidence grade B
- St. John's Wort for Depression (mild-moderate)Evidence grade B — Under guidance onlyEvidence grade B
- St. John's Wort for Mild-to-moderate depressionEvidence grade B — Cochrane: ~ as effective as SSRIsEvidence grade B
- St. John's Wort for Severe depressionEvidence grade C — Less clearEvidence grade C
Sources
This entry lists no references of its own — it is assembled from the entries it links to, whose sources are on their pages.
Last revised . A grade is this entry's reading of the evidence, not medical advice.