Best Milk Thistle Supplements 2026: Cost per Effective Dose
Top pick for Milk Thistle: NOW Foods Silymarin Milk Thistle Extract 300 mg, Double Strength (100 Capsules) — 300mg milk thistle seed per 1 capsule (300 mg), None (GMP), $0.17/day. Our best-value pick.
All Milk Thistle Supplements Compared
All 12 products sorted by cost per labelled serving (lowest first). Dose, certification, and pricing verified against NIH DSLD and manufacturer data.
Read the dose column before the price column. Servings in this category are not equivalent — they range from 150 to 3,000 mg per serving. A lower cost per day here can simply mean a smaller serving, so the cheapest row is not automatically the best value.
| Product | Brand | Dose / Serving | Cost / Day | Certification | Pick | Buy |
|---|---|---|---|---|---|---|
| Swanson Full Spectrum Milk Thistle 500 mg (100 Capsules) | Swanson | 500mg milk thistle seed / 1 capsule (500 mg) | $0.10 | None | Buy | |
| Horbaach Milk Thistle 3000 mg, 4:1 Extract (300 Capsules) | Horbaach | 3000mg milk thistle seed / 2 capsules (3000 mg equiv) | $0.11 | None | Buy | |
| NOW Foods Silymarin Milk Thistle Extract 300 mg, Double Strength (100 Capsules) | NOW Foods | 300mg milk thistle seed / 1 capsule (300 mg) | $0.17 | None (GMP) | Best Value | Buy |
| Jarrow Formulas Milk Thistle 150 mg, 30:1 Standardized (100 Capsules) | Jarrow Formulas | 150mg milk thistle seed / 1 capsule (150 mg) | $0.17 | None (Non-GMO) | Buy | |
| Nature's Bounty Milk Thistle 1000 mg, Rapid Release Softgels (50 ct) | Nature's Bounty | 1000mg milk thistle seed / 1 softgel (1000 mg) | $0.20 | None | Buy | |
| Nature's Way Milk Thistle, 175 mg Seed Extract, 80% Silymarin (120 Capsules) | Nature's Way | 175mg milk thistle seed / 1 capsule (175 mg) | $0.29 | None (TRU-ID authenticated) | Buy | |
| Pure Encapsulations Silymarin 250 mg (120 Capsules) | Pure Encapsulations | 250mg milk thistle seed / 1 capsule (250 mg) | $0.38 | None (hypoallergenic) | Buy | |
| Himalaya Milk Thistle Liver Support 350 mg (60 Capsules) | Himalaya | 350mg milk thistle seed / 1 capsule (350 mg) | $0.43 | USDA Organic + Non-GMO Verified | Buy | |
| Solaray Milk Thistle One Daily, Seed Extract 350 mg (60 Capsules) | Solaray | 350mg milk thistle seed / 1 capsule (350 mg) | $0.50 | None (lab verified) | Buy | |
| Thorne Milk Thistle Phytosome (Siliphos) (90 Capsules) | Thorne | mg milk thistle seed / 1 capsule | $0.54 | Third-party certified (Thorne) | Buy | |
| Thorne S.A.T. — Milk Thistle + Artichoke + Turmeric (60 Capsules) | Thorne | mg milk thistle seed / 1 capsule | $0.78 | Third-party certified (Thorne) | Buy | |
| Gaia Herbs Milk Thistle Seed, Liquid Phyto-Caps (120 Capsules) | Gaia Herbs | mg milk thistle seed / 3 capsules | $1.28 | None | Buy |
Our Picks
Best Value: NOW Foods Silymarin Milk Thistle Extract 300 mg, Double Strength (100 Capsules)
300mg milk thistle seed per 1 capsule (300 mg). None (GMP). $0.17/day. 100 servings per container at $17.35.
NOW Foods Silymarin Milk Thistle Extract 300 mg, Double Strength (100 Capsules) →
How We Rank Milk Thistle Supplements
Every product is evaluated on three criteria:
- Cost per day. Not cost per pill or cost per bottle — what it actually costs per day at the product's labelled serving. Where a category's servings differ in strength we flag it above the table, because cost per day is only comparable when the doses are.
- Third-party certification. USP Verified, NSF Certified for Sport, and ConsumerLab Approved indicate independent testing for purity, potency, and contaminants.
- Bioavailable form. We prioritize products using the specific chemical form shown to be most effective in published research.
Rankings are not influenced by affiliate commissions. We earn the same commission regardless of which product you choose. Read our full methodology.
Personalize Your Milk Thistle Choice
Not sure which milk thistle supplement is right for you? Use our free tools:
- DNA Supplement Analyzer — upload 23andMe or AncestryDNA data to check for genetic variants affecting milk thistle metabolism. Runs entirely in your browser.
- Lab Results Interpreter — enter your blood test values to get personalized dosing recommendations.
- Supplement Stack Builder — build a complete protocol based on your age, sex, medications, and goals.
- Supplement Audit — already taking milk thistle? Check if you have the right form and dose.
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