Top Picks
These are the products we currently recommend, chosen from what we have reviewed across the site. Each pick lists what it is good for and who it suits, so you can match one to your situation rather than defaulting to the cheapest listing.
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250 mg of standardized milk thistle extract per capsule, 120 capsules per bottle. The clean-label choice if you react to common allergens: free of egg, gluten, peanut, tree nut and wheat, non-GMO and vegan, with finished lots tested for potency and purity.

A 2-in-1 formula pairing milk thistle with dandelion extract, 120 capsules per bottle. Bronson manufactures and lab-tests in its own cGMP-registered New York facility, and the bottle is non-GMO, gluten-free and soy-free.

Standardized to 80% silymarin flavonoids from a concentrated 30:1 extract, so the active content is a known quantity rather than an inference from raw herb weight. USDA organic and certified kosher, 120 vegan capsules, roughly a four-month supply.

The most concentrated extract in this lineup at 50:1, standardized to 80% silymarin flavonoids. Every ingredient including the capsule shell is USDA organic, and 200 vegan capsules covers roughly six months.

300 mg of a 30:1 organic extract standardized to 80% silymarin, which the maker states is equivalent to 9,000 mg of raw milk thistle seed. USDA organic, vegan, non-GMO and lab verified, in a two-month supply.

Double strength at 300 mg per capsule, twice the 150 mg in NOW’s regular version, with artichoke and dandelion in the same formula. 200 vegetarian capsules, and NPA A-rated GMP certification that covers laboratory testing for stability and potency.