Milk thistle / silymarin
Full ranking Dose tool Products (921)
Key facts
Daily Value (US FDA)—
Tolerable Upper Intake Level (UL)— Reference upper value (cited, not a UL): 14,500 mg
Median (Per day)150 mgP5 24 – P95 600
Products921
Sources: https://webprod.hc-sc.gc.ca/nhpid-bdipsn/atReq?atid=milk.thistle.oral&lang=eng · Health Canada NNHPD monograph: 3-14.5 g dried fruit/day (4 g single); silymarin 140-600 mg/day
Daily dose across products (mg/day)
Reference upper value (cited, not a UL) 14,500
5 mglog scale · n=9213,000 mg
Label data from official national databases and brand websites, as declared; not lab-verified.
Common questions
Is there an official upper limit for Milk thistle / silymarin?
No UL has been set. We use a cited reference upper value of 14,500 mg per day. It comes from the linked study or assessment and is not a regulatory limit. [source]
How much Milk thistle / silymarin do products usually contain per day?
As of 2026-11-01, 921 products list a comparable daily dose (1,065 dose records; one product can have several). The median is 150 mg per day, and 90% of records fall between 24 and 600 mg. Figures come from labels and are not lab-tested. [source]
Top ranked
| Rank | Brand | Product | Per day | Score |
|---|---|---|---|---|
| 1 | Solaray | Milk Thistle Extract 175 mg | 350 mg | 100.0 |
| 2 | Nature's Bounty | Silymarin Milk Thistle | 500 mg | 97.8 |
| 2 | Vitamin World | Silymarin Milk-Thistle | 500 mg | 97.8 |
| 4 | Douglas Laboratories | Milk Thistle | 175 mg | 94.4 |
| 4 | Nature's Way | Milk Thistle | 525 mg | 94.4 |
For information only; not medical advice. Talk to a doctor or pharmacist before starting or stopping any supplement.