St. John's wort
Full ranking Dose tool Products (117)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Reference upper value (cited, not a UL): 4,200 mg
Median (Per day)300 mgP5 20 – P95 880
Products117
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=stjohnswort.millepertuis.ora · Health Canada NNHPD monograph: 2-12.6 g dried herb/day, 4.2 g single; extract 600-1,800 mg
Daily dose across products (mg/day)
Reference upper value (cited, not a UL) 4,200
4 mglog scale · n=1172,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for St. John's wort?
No UL has been set. We use a cited reference upper value of 4,200 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much St. John's wort do products usually contain per day?
As of 2026-11-01, 117 products list a comparable daily dose (139 dose records; one product can have several). The median is 300 mg per day, and 90% of records fall between 20 and 880 mg. Figures come from labels and are not lab-tested. [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Nutralab Canada Corp. | MapleLife Nutrition and Formula St. John's Wort | 300 mg | 93.3 |
| 1 | NOW Health Group, Inc. | Now St. John’s Wort Extract | 300 mg | 93.3 |
| 1 | GFR Pharma Ltd. | St. John's Wort | 300 mg | 93.3 |
| 1 | International Vitamin Corporation | St. John's Wort 300 mg Standardized Extract Capsules | 300 mg | 93.3 |
| 1 | Integria Healthcare (Australia) Pty Ltd | St. John's Wort High Grade 1:2 | 500 mg | 93.3 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.