What third-party testing actually proves, what it doesn't, and how to check any certification claim with a browser.
Research-based assessment; not independently lab tested.
Third-party tested means an independent organization checked something specific about an exact product. The mark does not cover every flavor, every country, or every batch.
That single sentence will protect you from most misleading supplement claims. A certification mark is not a blanket endorsement of a brand. It is evidence about one defined product, tested a particular way, at a particular time. The rest of this guide explains what the common marks actually establish, how to verify them yourself with a browser, and what to do when the evidence is missing.
Almost nothing, until you know the answers to four questions:
"Third-party tested" can refer to very different checks:
Label-claim verification. An independent lab measures whether the product contains the amount of creatine stated on the label. Scope: one tested lot or sample, not every future batch.
Banned-substance screening. The product is screened against a list of prohibited substances (important for tested athletes). Scope: the screened product and the substances on the panel at the time of testing.
Purity or contaminant testing. The lab measures specific impurities such as heavy metals or other contaminants against defined limits. Scope: the tested analytes, the tested lot, and the limits applied.
These are different checks with different scopes. A product can pass one and never have undergone the others.
NSF describes its Certified for Sport program as independent certification of sports supplements. For a product carrying the mark, the practical meaning is:
To look up the exact listing: open NSF's Certified for Sport product search, search the exact brand and product name, match the flavor, form, package size, and country, and note the listing status and any listing or update date shown.
A listing date tells you when the certifier recorded or updated the entry. It is not the same as the date a specific tub was manufactured. Use it to confirm the listing is current, not to date your package.
Informed Sport describes its program as certification and testing for sports nutrition products, with an emphasis on banned-substance screening. For a product carrying the mark, the practical meaning is:
To verify: open informed-sport.com, the program's official site, and search the certified product listings by brand, product, or batch. Match flavor, format, and region, and check that the listing is current.
A certificate of analysis (COA) is a document from a laboratory reporting test results for a specific sample. A typical creatine COA shows: the product or lot tested, the date of testing, the analytes tested (for example, creatine content, moisture, specific impurities), the results and the limits or specifications applied, and the laboratory that performed the testing.
How to read a COA: confirm the lot or batch on the COA matches the lot on your package; check the test date (a five-year-old COA says little about today's batch); read which analytes were tested (a creatine-content result does not prove heavy-metal screening); read the limits ("pass" only has meaning against stated specifications); note who did the testing (manufacturer lab, contract lab, or independent lab).
A COA describes one sample at one time. Certification programs involve ongoing requirements: facility audits, periodic retesting, and continued listing. A single COA, however detailed, does not establish that a product remains certified today.
A trademarked ingredient name (for example, Creapure) identifies the raw-material source and its manufacturing standard. It tells you where the creatine came from and under what quality system it was made. It does not tell you the finished product was independently tested, that the tub in your hand matches the label, or that the product is certified by NSF, Informed Sport, or anyone else.
And trademark claims can retire. If a company changes suppliers, the old trademark no longer describes the new product. The Momentous June 2026 formulation change is the worked example: Momentous states it no longer sources its creatine from Creapure, and now uses its Signature Spec Creatine. Any page still describing that product as Creapure-sourced is describing an old formulation. See the Formulation Change Log for the dated record.
Every step is reproducible with a browser. No account, purchase, or lab access is required.
No certification mark means less independent information, not proof of poor quality. A product can be well made and uncertified. But the reverse is also true: a brand claim is never a verified certificate. "Third-party tested" on a product page, without a named certifier, a listed product, and a verifiable record, is marketing language, not evidence.
Match the mark to the exact product. Check the certifier's listing yourself. Record the date. And when a formulation changes, re-verify: the old certificate belongs to the old version.
For the full label workflow, use the Creatine Label Checklist. For dated formulation changes, see the Formulation Change Log.