Solaray Milk Thistle Seed Extract 350 mg, One Daily, Guaranteed 80% Silymarin, 60 VegCaps Review
#6 of 9 · Best One-a-Day✓ Label verified · Supplement Facts read Aug 27, 2026Real retailer photo, cut out. Label unedited.
Consider it. The path of least resistance. One vegan capsule, 280 mg silymarin, guaranteed (not just labeled) 80% potency.
~$18~$0.30/serving (1 cap)
Why It Scores 7.2 — And The Label Line Behind Each Number
Form & Bioavailability
30% of scorePlain milk thistle seed extract standardized to 80% silymarin — no phytosome, so the ordinary absorption ceiling applies. Solid, straightforward form with no delivery enhancement.
- Form
- Milk thistle seed extract 350 mg (guaranteed 280 mg [80%] silymarin) plus 110 mg milk thistle seed (veg cap)
Silymarin/Silybin Dose vs Clinical Range
25% of score280 mg silymarin in one capsule is the highest single-cap dose among the plain extracts, and 'guaranteed 80%' means the potency is assured, not just labeled. It still lands a bit under the ~420 mg used in several trials.
Third-Party Testing & Quality Assurance
20% of scoreThe bottle carries the Non-GMO Project Verified seal (listed as verified in the Non-GMO Project's own product finder), which certifies GMO status only, plus a 'Lab Verified' badge that is Solaray's own in-house program (its Ogden, Utah lab, per solaray.com/pages/quality). The guaranteed-potency label is better than a bare labeled minimum, but there is no independent NSF or USP product seal, so it stays mid-tier here.
- Testing
- Non-GMO Project Verified; 'Lab Verified' = Solaray in-house lab; no NSF/USP seal
Value per Effective Serving
15% of scoreAt ~$18 for 60 one-a-day servings (~$0.30 each), value is good given the high single-cap dose, though a 60-count bottle is smaller than the big-bottle value picks.
- Supply
- 60 VegCaps = 60 servings (one daily)
- Price
- ~$18
- Cost per serving
- ~$0.30/serving (1 cap)
Formulation Suitability & Tolerability
10% of scoreVegan VegCaps, Non-GMO Project Verified, and a convenient once-daily format — an adherence-friendly, broadly tolerable profile.
- Suitability
- Vegan, Non-GMO Project Verified
- More Specs
- Silymarin load
- 280 mg silymarin per capsule
Label verified. Every figure read from the Supplement Facts photo, Aug 27, 2026.
Marketing Claims Vs. Reality
Guaranteed 80% silymarin (280 mg per capsule)
The panel prints Milk Thistle seed extract 350 mg (guaranteed to contain 280 mg [80%] silymarin) and a second line, Milk Thistle seed 110 mg, per VegCap. The 280 mg guarantee applies to the extract line; the 110 mg of seed has no declared silymarin figure.
One-a-day dosing
The product is formulated and labeled for once-daily use, and the 280 mg single-cap dose supports that positioning.
Non-GMO Project Verified and Lab Verified
The Non-GMO Project's product finder lists Solaray Vital Extracts Milk Thistle 350 mg 60 VegCaps as verified (GMO status only). 'Lab Verified' is Solaray's own program run in its Ogden, Utah lab (solaray.com/pages/quality), so potency is brand-attested; the panel shows no NSF or USP product seal.
Supports healthy liver function
Even at 280 mg the dose is below the ~420 mg used in trials, and high-quality studies (Rambaldi 2005) found no confirmed benefit, so the claim is only partly supported.
What Our Test Actually Found
Adherence is the advantage
The single biggest predictor of a supplement working is taking it. A genuine one-a-day at 280 mg removes the friction of multi-cap regimens, which is a real, underrated edge over higher-count bottles you have to dose 2–4 times.
'Guaranteed' beats 'labeled'
A guaranteed-potency claim means the 80% is assured through shelf life, not just a manufacturing target. On the dose axis that's a meaningful step up from a bare labeled minimum.
Still short of the trial dose
280 mg is the most per single cap among plain extracts, but several liver studies used ~420 mg/day. If you want to match that exactly, you'd double up — which erodes the one-a-day appeal.
Standard absorption, in-house testing
It's plain extract, so take it with food, and the potency testing is Solaray's own lab (the Lab Verified badge) rather than an independent NSF or USP seal; only the Non-GMO Project Verified seal is third-party, and it covers GMO status. Those two points, not the dose, are what hold it at #6.
Full analysis: all pros & cons (7), buy if / skip if
- Highest single-capsule silymarin of the plain extracts — 280 mg guaranteed in the extract line, one a day
- Guaranteed (not just labeled) 80% potency
- Convenient once-daily dosing, vegan caps
- Non-GMO Project Verified; Lab Verified badge is Solaray's own Utah lab
- Plain extract — no absorption enhancement
- 280 mg/day still sits below the ~420 mg used in several liver studies
- Smaller 60-count bottle; no independent NSF/USP potency seal
- You want a genuine one-a-day and hate multi-cap regimens
- You value a guaranteed-potency label over a labeled minimum
- You want a vegan single-ingredient extract
- You want a phytosome or clinical-max dose
- You want an independent NSF/USP potency seal
One vegan capsule, 280 mg silymarin, guaranteed (not just labeled) 80% potency. It's plain extract, so absorption is standard, and it's a touch under the classic trial dose — but if a single daily cap is what gets you to actually take it, that adherence edge is worth a lot.
The easiest one-and-done pick. A single vegan capsule delivers 280 mg of silymarin from a guaranteed-potency 80% extract — the most silymarin per capsule of any plain extract here — so adherence is effortless. Two caveats keep it mid-pack: it's still plain extract with no absorption enhancement, and even 280 mg sits a touch under the classic ~420 mg trial dose.
The easiest one-and-done
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. Two caveats keep it mid-pack: it's still plain extract, and even at 280 mg you're a touch under the classic trial dose. If a single daily capsule is what gets you to actually take it, that adherence edge is worth a lot.
If This Doesn’t Fit — Try These
04Nutricost Milk Thistle 300 mg
This is the value winner and the sane default for most people — a legitimate 80% extract at a price that makes daily use painless.
02Life Extension Advanced Milk Thistle
This is the pick if your goal is to hit a trial-level silymarin dose without counting out four capsules — one serving does it, and the Siliphos fraction hedges the absorption problem.
03Pure Encapsulations Silymarin
If you react to fillers or just want the cleanest possible silymarin, this is the one — a bare-bones, hypoallergenic capsule from a brand clinicians reach for by reflex.
Quick Answers
Is one capsule a day really enough?
It delivers 280 mg of silymarin — the most per single capsule of the plain extracts — but that's slightly below the ~420 mg used in several trials. For most maintenance use it's fine; to match trial doses you'd take two.
What does 'guaranteed 80% silymarin' mean?
It's a potency guarantee rather than a labeled minimum, meaning the 80% standardization is assured through the product's shelf life — a step up from products that only list a target.
Is the testing independently certified?
Only partly. The bottle carries the Non-GMO Project Verified seal, which the Non-GMO Project's own product finder lists for this Solaray Milk Thistle 350 mg 60 VegCaps; that certifies GMO status, not potency. The 'Lab Verified' badge is Solaray's own program, tested in its Ogden, Utah lab (solaray.com/pages/quality says testing is mainly in-house). There is no NSF or USP product seal on the panel, so treat potency as brand-attested.
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. No significant benefit on mortality or complications was seen in high-quality trials.
- [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 favorable supportive effects at a lower evidence tier than controlled trials.
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