Talk to a builder →
Testing + certificates

What is third-party testing?

⚡ Short answer

Third-party testing means a batch is tested by an independent lab that has no stake in the result, not by the seller or manufacturer. The strongest version is a lab accredited to ISO/IEC 17025 whose reports you can verify yourself.

Educational onlyUpdated 21 Oct 2026
Testing + certificates

Why independence matters

A seller testing its own product has a reason to report good results. An independent lab is paid to test, not to pass, so its results carry more weight with buyers and with payment processors reviewing a store.

Testing + certificates

What makes a lab credible

Accreditation to ISO/IEC 17025, the international standard for testing laboratories.
Named methods on the report, such as HPLC and mass spectrometry.
A real address and contact details.
A way to verify each report, such as a code you can check on the lab's website.
Testing + certificates

One test is not forever

A third-party result covers the batch that was tested. A new batch needs a new report, so a store should publish certificates batch by batch, not one certificate for everything.

Educational information only

Educational information only. Nothing here is medical advice, dosing guidance or a recommendation to use any substance. Research peptides are not approved medicines and are not for human or animal consumption. Speak to a qualified professional and follow the law where you are.

Related questions

Testing + certificatesWhat is a certificate of analysis (COA)?Testing + certificates. Educational only.Read →Testing + certificatesHow do you read a peptide COA?Testing + certificates. Educational only.Read →Choosing a supplierWhat are the red flags in a supplier?Choosing a supplier. Educational only.Read →Peptide basicsWhat is a peptide?Peptide basics. Educational only.Read →Compound profilesWhat is BPC-157?Compound profiles. Educational only.Read →Compound profilesWhat is TB-500?Compound profiles. Educational only.Read →Compound profilesWhat is GHK-Cu?Compound profiles. Educational only.Read →Testing + certificatesWhat is HPLC purity?Testing + certificates. Educational only.Read →Testing + certificatesWhat does mass spectrometry confirm?Testing + certificates. Educational only.Read →Peptide basicsWhat does lyophilized mean?Peptide basics. Educational only.Read →RegulationWhat does "research use only" mean?Regulation. Educational only.Read →Peptide basicsWhat is the difference between a peptide and a protein?Peptide basics. Educational only.Read →Peptide basicsWhat is a "research peptide"?Peptide basics. Educational only.Read →Compound profilesWhat is Semax?Compound profiles. Educational only.Read →Compound profilesWhat is SS-31?Compound profiles. Educational only.Read →Testing + certificatesIs HPLC purity the same as net peptide content?Testing + certificates. Educational only.Read →Testing + certificatesWhat is endotoxin testing?Testing + certificates. Educational only.Read →Lab handling + storageHow are lyophilized peptides stored?Lab handling + storage. Educational only.Read →RegulationHow are peptides regulated in the UK?Regulation. Educational only.Read →

Watch HPLC, mass spec and COAs