What “Third-Party Tested” Actually Means
“Third-party tested” appears on almost every research peptide page. The phrase is only as good as what stands behind it.
The basic idea
Third-party testing means a laboratory that is independent of the seller analysed a sample and issued the report. Independence is the point: the lab has no reason to flatter the product.
What makes it meaningful
- The report is specific to a batch, and the batch number matches the product.
- The laboratory is named and can be contacted.
- The methods used are stated, such as HPLC for purity and mass spectrometry for identity.
- The report is complete and unaltered.
Accreditation
Some laboratories are accredited to ISO/IEC 17025, the international standard for testing and calibration laboratories. Accreditation means an outside body has assessed the lab’s competence, methods and record-keeping. It is a useful signal rather than a requirement, and it is worth checking which tests fall within the lab’s accredited scope.
Limits to keep in mind
- Who chose the sample? A sample sent by the seller may not represent the whole batch.
- A report is a snapshot of one batch on one date.
- Independent does not automatically mean complete. See How to Read a Certificate of Analysis for what a report does not cover.
How to check
Match the batch number, read the methods, and contact the laboratory if anything is unclear. Our Quality page describes how we handle testing, and each product page links to its certificate of analysis.
For laboratory research use only. Not for human or veterinary use. See our Research Use Only page.