How to Check If Your Supplement Is Third-Party Tested

Last updated: September 8, 2026

“Third-party tested” is the beginning of a question. Find out who tested the product, what was checked, and which formulation or batch the evidence covers.

First identify the type of record

• Brand statement: a claim that needs a supporting source.
• Laboratory report: results for an identified sample and testing scope.
• Product certification: a listing under a named program.
• Facility credential: a record about specified manufacturing operations.

These records can be useful together, but none should silently replace another. A supplier’s ingredient report is not automatically a test of the finished product; a facility credential does not establish certification of everything produced there.

Verify a product in five steps

1. Save the label. Record the full name, ingredients, strength, flavor, size and market.
2. Find the source. Use the directory for the exact program named, not a retailer’s badge image.
3. Match scope. Compare product details and any listed lots; unresolved details stay unresolved.
4. Check timing. Note the current status and observation or report date.
5. Ask about discrepancies. Contact the certifier or manufacturer if names, formulas or status conflict.

Read a laboratory report

Look for a sample identifier, product and lot, laboratory, date, methods, measured results and units. Determine whether “pass” refers to a stated specification and whether the report concerns the finished supplement. A missing public report means you cannot assess those results; it does not prove the company performed no testing.

Use the correct directory

• NSF dietary supplement listings
• NSF Certified for Sport
• USP verified products
• Informed Sport
• Informed Choice

For differences between programs, see our certification comparison. The directory list is not a claim that these are the only sources of independent testing.

Use SupplementChecker as a record of reviewed evidence

Our brand lookup displays accepted product records and identifies incomplete coverage. We do not treat an older database flag as verification or a missing entry as evidence of no testing. A product record does not establish individual medical suitability.

Guide text updated 2026-09-08. Individual evidence records have their own review dates. Read the evidence method.

Look up a brand’s reviewed evidence →