Third-Party Tested Supplements: What Each Certification Checks

The short answer: the US Food and Drug Administration does not approve dietary supplements for safety or effectiveness before they are sold, and the manufacturer is responsible for safety and labelling (FDA). A named third-party certification is therefore one of the few outside checks on what is actually in a product. Look for a certifier by name: NSF Certified for Sport or USP Verified for general products, Informed Sport for banned-substance screening, IFOS for fish oil. “Third-party tested” with no name attached is a claim, not a certification. None of them show that a supplement works. Talk to your doctor before starting one.

What each programme checks

Descriptions come from the programmes’ own pages where our reader could open them (Informed Sport, NSF’s sport site, IFOS) and, where it could not (nsf.org and usp.org returned 403), from search results, the sport regulator and a fish oil tracker, labelled below. We did not audit any certifier.

What the brands in our cost table state

From the cost per study dose dataset on 29 Sept 2026, 44 product entries across 12 compounds (recounted from the dataset file in an independent audit), as each brand’s page states it:

Counts are ours, from the pages as read. Elysium’s page asks the reader to confirm certification per lot, and Momentous omega-3 states IFOS as well as NSF (counted once, under NSF). The brand set is a convenience sample, not a market ranking, and a page that is silent may still be certified elsewhere. Certified products are not dearer by rule: certified creatine costs $14.67 to $17.50 a month at the trial dose against $7.19 for uncertified Nutricost, but the two cost less than $18 either way (creatine page).

How to check a claim yourself

• Find the certifier’s name and search its public directory for the exact product and size.
• For fish oil, look for a lot-number certificate and match it to your bottle (omega-3 page).
• Treat a facility certification (“made in an NSF certified facility”) as different from a certified product; our dataset records them separately.
• Sport certification matters mainly if you are drug-tested; for everyone else, the contaminant and label checks are the useful part.

For where each compound sits on evidence, see the graded supplement ladder.

Method note

Researched from the FDA and USADA pages, the Informed Sport, NSF sport and IFOS sites, programme descriptions for NSF’s main site and USP as returned by search and a fish oil tracker (nsf.org and usp.org blocked our reader), and brand pages in the dataset; checked 29 Sept 2026. Prices elsewhere on the site are one-time list prices. We did not test any product or audit any certifier. General information, not medical advice.