Nutricost Milk Thistle 300 mg (80% Silymarin), 120 Capsules Review
#4 of 9 · Best Value✓ Label verified · Supplement Facts read Aug 27, 2026Real retailer photo, cut out. Label unedited.
Buy it. The sane default for most people. A real 80% extract at a price that makes daily use effortless.
~$16~$0.13/cap
Why It Scores 7.5 — And The Label Line Behind Each Number
Form & Bioavailability
30% of scorePlain milk thistle extract standardized to 80% silymarin — no absorption enhancement, so the ordinary oral ceiling applies. Take it with food. Solid, honest form for the money, but not a phytosome.
- Form
- Milk thistle extract, 80% silymarin (veg capsule)
Silymarin/Silybin Dose vs Clinical Range
25% of score~240 mg silymarin per capsule from a real 80% standardization. One capsule sits below the ~420 mg used in several trials, but two easily clears it and still costs less than most single-cap rivals.
Third-Party Testing & Quality Assurance
20% of scoreThird-party testing is brand-stated and the facility is GMP/FDA-registered, but there's no independent NSF or USP seal. Adequate, not a standout — the main reason it isn't higher-ranked.
- Testing
- Brand-stated third-party tested; GMP/FDA-registered facility
Value per Effective Serving
15% of scoreThe class leader: 120 real 80%-standardized servings for about $16 is the best cost-per-milligram-of-silymarin of any straight extract here. This axis is why it earns the Best Value badge.
- Supply
- 120 capsules = 120 servings
- Price
- ~$16
- Cost per serving
- ~$0.13/cap
Formulation Suitability & Tolerability
10% of scoreNon-GMO and gluten-free in a veg capsule — a clean, broadly tolerable profile with no notable drawbacks.
- Suitability
- Non-GMO, gluten-free
- More Specs
- Silymarin load
- ~240 mg silymarin per capsule
Label verified. Every figure read from the Supplement Facts photo, Aug 27, 2026.
Marketing Claims Vs. Reality
300 mg extract standardized to 80% silymarin (~240 mg silymarin)
The label discloses a 300 mg extract at 80% standardization, which computes to ~240 mg silymarin per capsule — a genuine, verifiable standardization.
Third-party tested
Testing is stated by the brand and the facility is GMP/FDA-registered, but no independent NSF or USP certification seal is provided to confirm it.
Non-GMO and gluten-free
The label lists non-GMO and gluten-free status consistent with the veg-capsule formulation.
Supports liver health
Dose is reasonable, but high-quality trials and meta-analyses (Rambaldi 2005) found no confirmed clinical benefit, so the liver-support claim is only partially supported.
What Our Test Actually Found
Best cost-per-milligram in the set
On the 15%-weighted value axis nothing here beats it: 120 legitimately standardized servings for ~$16. If you take milk thistle daily, this is the cheapest way to do it with a real 80% extract.
Mind the single-cap dose
One capsule's ~240 mg sits below the ~420 mg silymarin used in several liver trials. Two capsules a day clears that window — and even then it undercuts most single-cap rivals on price.
Cleaner than the cheaper Nutricost SKU
Nutricost also sells a cheaper 4:1 non-standardized milk thistle. This 80%-standardized version is the one worth buying — a defined silymarin percentage rather than an undefined concentrate.
Testing is the ceiling on rank
The one thing separating it from the podium is the paper trail: brand-stated testing, no independent seal. Quality-over-price is exactly why it's #4 despite winning on cost.
Full analysis: all pros & cons (7), buy if / skip if
- Real 80% standardization at a budget price (240 mg silymarin/cap)
- Outstanding cost-per-mg-silymarin — 120 servings for ~$16
- Cleaner spec than Nutricost's cheaper 4:1 non-standardized SKU
- Non-GMO and gluten-free
- Third-party testing is brand-stated, not an independent NSF/USP seal
- Plain extract — absorption is the standard limitation
- Single 240 mg/day serving sits below the ~420 mg used in several trials
- You want a legitimate standardized extract on a budget
- You take milk thistle daily and want low cost-per-mg
- You're fine with plain extract taken with food
- You want an independent third-party seal
- You want the phytosome absorption edge
A real 80% extract at a price that makes daily use effortless. It's plain extract with average absorption, and the testing is the brand's own word rather than an NSF/USP seal — which is exactly why quality-over-price lands it at #4, not #1. Take two a day and it's still cheaper than most single-cap rivals.
This is the value winner and the sane default for most people. Nutricost delivers a legitimate 80%-standardized extract at roughly $0.13 a capsule, which makes daily use painless and gives it the best cost-per-milligram-of-silymarin of any straight extract in the set. Two knocks keep it out of the top three: the third-party testing is brand-stated rather than an independent seal, and it's plain extract, so absorption is average.
The value winner and the sane default
This is the value winner and the sane default for most people — a legitimate 80% extract at a price that makes daily use painless. Two knocks keep it out of the top three: the testing is the brand's own word rather than an independent seal, and it's plain extract, so absorption is average. Quality-over-price is exactly why it's #4 and not #1 — but take two a day and it's still cheaper than most single-cap rivals, which earns it the Best Value badge.
If This Doesn’t Fit — Try These
05NOW Silymarin Double Strength
A strong-value big bottle if you actively want the traditional liver-herb stack — artichoke and dandelion ride along with a real silymarin dose.
06Solaray Milk Thistle 350 mg
The easiest one-and-done pick — a single vegan capsule delivers the most silymarin per cap of any plain extract here, with a guaranteed-potency label.
01Thorne Milk Thistle Phytosome
If you want the form the bioavailability science actually points to, from the brand with the strongest quality reputation in this list, this is it.
Quick Answers
Is this a real standardized extract or a cheap concentrate?
It's a genuine 300 mg extract standardized to 80% silymarin (~240 mg per capsule) — distinct from Nutricost's cheaper 4:1 non-standardized SKU, which doesn't disclose a fixed silymarin percentage.
How many should I take?
One capsule provides ~240 mg silymarin, below the ~420 mg used in several trials. Two a day reaches that range — and even then it's cheaper than most single-capsule competitors.
Is the third-party testing verified?
Testing is stated by the brand and the facility is GMP/FDA-registered, but there's no independent NSF or USP seal, so treat the testing as brand-attested rather than certified.
Sources & Further Reading
2 peer-reviewed sources, each linked to PubMed
- [1] Rambaldi A, Jacobs BP, Iaquinto G, Gluud C. Milk thistle for alcoholic and/or hepatitis B or C liver diseases—a systematic review with meta-analyses. Am J Gastroenterol. 2005;100(11):2583-2591. PMID 16279916 — Milk thistle for alcoholic and/or hepatitis B or C liver diseases—a systematic review with meta-analyses of randomized clinical trials. High-quality trials showed no significant effect of milk thistle on mortality or liver-disease complications.
- [2] Gillessen A, Schmidt HH. Silymarin as Supportive Treatment in Liver Diseases: A Narrative Review. Adv Ther. 2020;37(4):1279-1301. PMID 32065376 — Silymarin as Supportive Treatment in Liver Diseases: A Narrative Review. Reports supportive effects of silymarin, but at a lower evidence tier than randomized trials.
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