Every supplement brand claims their products are tested. The phrase has become so ubiquitous it’s almost meaningless. But the difference between real third-party testing and a marketing claim is the difference between a verified product and a guess.
What Third-Party Testing Actually Is
Third-party testing means an independent laboratory — one with no financial relationship to the brand — analyzes the product. The lab tests for what the label claims (potency, ingredient identity, concentration) and for what shouldn’t be there (heavy metals, microbial contamination, pesticides, solvent residues). The results are documented in a Certificate of Analysis (COA).
The key word is independent. In-house testing done by the manufacturer doesn’t qualify. Testing performed by a lab that also manufactures for the brand doesn’t qualify. The lab must have no commercial incentive to produce favorable results.
What a COA Tells You
A legitimate COA includes the product name and lot number, the date of testing, the specific tests performed, the results of each test with acceptable ranges, the name and accreditation of the testing laboratory, and a signature from the lab director or authorized representative. If a COA doesn’t include a lot number or the name of the lab, it’s not a real COA — it’s a branded document meant to look like one.
The Tests That Matter
Identity testing confirms the ingredient is what the label says. A capsule labeled as ashwagandha should contain ashwagandha root extract, not a cheaper botanical filler. HPLC (High-Performance Liquid Chromatography) and FTIR (Fourier-Transform Infrared Spectroscopy) are common methods.
Potency testing measures how much active compound is present. If the label says 600mg of KSM-66 ashwagandha per serving, the COA should show that concentration — not 400mg, not 580mg, but within a defined tolerance of the claim (typically ±10%).
Contaminant testing screens for heavy metals (lead, arsenic, cadmium, mercury), microbial contamination (E. coli, salmonella, yeast, mold), and in some cases pesticide residues or solvent residues from extraction processes. The acceptable limits are defined by USP (United States Pharmacopeia) or the testing lab’s protocols.
Accreditation Standards
Look for labs accredited to ISO 17025, the international standard for testing laboratories. NSF International, USP, and Eurofins are well-known accredited testing organizations. Some brands also carry the NSF Certified for Sport mark, which means the product has been tested for over 280 substances banned in competition.
Red Flags
If a brand claims testing but won’t share the COA on request, that’s a red flag. If the COA uses the brand’s own letterhead instead of the lab’s, that’s a red flag. If the lab named on the COA doesn’t have a verifiable website, accreditation number, or address, that’s a red flag. And if the COA is a generic document that doesn’t reference a specific lot number, it may cover a single batch from years ago — not what’s currently on the shelf.
At Topgun Goods, every product we carry has a current COA from an independent lab. We don’t just trust the manufacturer’s word. We verify.