Supplement Brand Report Cards
These report cards compare supplement brands on data: certification statements, cost per dose, and price against the category median. Each report card is computed from our own catalog.
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Kirkland Signature (Costco)
All 44 Kirkland Signature labels filed with the NIH: 70.5% state USP Verified (label statements; we did not check each in the public registry). Cost per dose and label details for the fish oil, D3, CoQ10, multivitamin and glucosamine.
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AG1 (Athletic Greens)
AG1 next to 13 other greens powders on Amazon: price per serving, scoop size, what each label lists, and which are on NSF and Informed lists.
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Thorne
34 products tracked. Certification statements, registry-confirmed products, and price vs category median.
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Nature Made
25 products tracked. Certification statements and registry status, and price vs category median at mass-market prices.
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NOW Foods
107 products tracked, the widest catalog we cover. Certification statements and registry status.
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Sports Research
21 products tracked. A smaller catalog, with certification statements and registry status.
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Doctor's Best
22 products tracked; we did not find any in a public certification registry. Frequently our best-value pick on cost per dose.
- Coming soon
More brands
We are building out report cards for the other brands in our catalog next. Check back, or see our full supplement comparisons in the meantime.
About our data
Every report card uses the same catalog and cost-per-dose method as the site. See our methodology for the full detail.