How to tell if a supplement is third-party tested (NSF, USP, Informed Sport, IFOS)
· 3 min read · By Value Servings
Why testing matters
Under the Dietary Supplement Health and Education Act of 1994, supplements are regulated more like food than drugs. Makers must follow manufacturing rules and not sell adulterated or mislabeled products, but they do not have to prove a product's contents to the FDA before selling it. The FDA mostly acts after problems appear.
That is how products end up with doses far from the label, as tests of supplement gummies have shown. Third-party certification is a voluntary check that a brand pays for.
What each seal checks
| Program | Checks label accuracy | Checks contaminants | Screens for banned sport substances | Covers |
|---|---|---|---|---|
| USP Verified | Yes | Yes | No | Supplements and ingredients |
| NSF Contents Certified (NSF/ANSI 173) | Yes | Yes | No | Supplements |
| NSF Certified for Sport | Yes | Yes | Yes | Sports supplements |
| Informed Sport | Screens each batch | Limited | Yes | Sports supplements |
| Informed Choice | Regular market sampling | Limited | Yes | Sports supplements |
| IFOS | Yes (EPA/DHA) | Yes (metals, PCBs, oxidation) | No | Fish and omega-3 oils |
| Creapure | Raw material spec | Yes, for its creatine | No | One creatine raw material |
Simplified. Each program's own site lists exactly what it tests.
Creapure is not a testing program. It is a trademarked creatine monohydrate made by AlzChem in Germany, with published purity specifications. It tells you where the raw material came from.
How to verify a seal
- Find the exact product name, size and flavor on the certifier's website: NSF Certified for Sport, USP, Informed Sport, or IFOS.
- Check that the listing matches your product, not just the brand. Certification is per product, sometimes per flavor.
- For batch programs (Informed Sport, IFOS), match the lot number on your container.
- Recheck after reformulations. When a brand changes supplier or recipe, a certificate may change too. For example, Momentous moved its creatine from Creapure to its own NSF Certified for Sport material in 2026.
What does not count
- "Lab tested" or "third-party tested" with no named lab or program.
- "Made in an FDA-registered facility." Registration is not approval or inspection of the product.
- "GMP certified" alone. Good manufacturing practice is about process, and it is required by law anyway.
- A certificate of analysis (COA) from the brand's own lab. Better than nothing; not independent.
How our lists show it
A product on our lists shows a named certificate only when the store's own product page names it. We do not test products ourselves. Products without a named certificate are not necessarily worse; it means the store page does not say. When a product with a named certificate still costs less per serving than the popular brand, the cheapest one gets a "Best third-party tested" award under the list, so you can see what testing costs. See how it works.
Frequently asked questions
Does the FDA test supplements?
Not before they are sold. The FDA can act against unsafe or mislabeled supplements after they are on the market.
What is the best third-party certification for supplements?
It depends on the need. USP Verified and NSF Contents Certified cover label accuracy and contaminants. Athletes subject to drug testing should use NSF Certified for Sport or Informed Sport. For fish oil, IFOS publishes lot-level results.
Is NSF Certified for Sport better than Informed Sport?
Both screen for banned substances and are widely accepted by sports organizations. Check which one your league or governing body recognizes.
Are cheap supplements less safe?
Not necessarily. Price and quality are not tightly linked. A cheap product with a verified seal can be a better bet than an expensive product without one.
Sources
This is general information about prices and labels, not medical advice. Ask a doctor or pharmacist before starting a supplement, especially if you are pregnant, take medication, or have a health condition. We don't sell the products; how we make money.