CertwellCertwell

How it works

  1. 1

    Search

    Enter a supplement name, brand, or category — for example "magnesium", "omega 3", or "Solgar". Certwell searches across product names, brands, and categories.

  2. 2

    See certified products

    Results show certification badges from NSF, USP, Informed Sport, and IFOS. Certified products are surfaced clearly so you can tell at a glance which options have been independently verified.

  3. 3

    Filter by certification

    Use the certification filters to narrow results to a specific body — for example, IFOS for fish oil or NSF for sports supplements.

  4. 4

    Buy from a UK retailer

    Each product page lists UK retailers where you can buy it. Click through to check availability and price.

No certified match found?

If a product you search for has no supported certification, Certwell shows certified alternatives in the same category so you can find a higher-trust option.

Absence of certification does not mean a product is unsafe — it means it has not been independently verified by one of the supported bodies. See what each certification covers.