Research results are only as dependable as the materials behind them. This page explains how we approach third-party testing, what the numbers on a certificate of analysis mean and how you can check a result for yourself. All products are sold for laboratory research use only.
Independent, third-party testing
We send samples to independent laboratories rather than relying on our own statements. The certificates we have published so far come from laboratories such as Janoshik, Chromate and Freedom Diagnostics, and each one names the laboratory, the method, the test date and the batch.
We publish what we hold. Not every product has a certificate in our library yet. Where a certificate exists, the product page links to it. Where it does not, the page does not claim otherwise. The full list is in the COA library.
What the results tell you
Purity. Most of our published results use HPLC with UV detection, which separates a sample and measures the share of the total signal that belongs to the main peak. It is a relative figure under one set of conditions. Our guide to HPLC vs LC-MS explains how it differs from mass-based identity testing.
Identity. LC-MS compares the measured molecular mass with the expected mass of the named compound. Some certificates include it; others do not.
Endotoxin. Where a laboratory reports endotoxin, the result is given in endotoxin units (EU) per vial. It comes from a separate assay and matters mainly for cell-based work. Read more in Endotoxin Testing Explained.
How to read a certificate of analysis
- Check the laboratory name and the report or task number.
- Match the batch number to your vial or product record.
- Find the method (for example HPLC-UV or LC-MS).
- Read the purity figure and any measured quantity.
- Look for an endotoxin line and the laboratory’s comments.
A step-by-step walk-through is in How to Read a Certificate of Analysis.
Batch numbers
A certificate describes the batch that was tested. The batch number printed on the report should match the batch of the product you hold. We show the batch number next to every published result. See What Batch Numbers Mean.
Handling and storage
Lyophilized research peptides should be kept sealed and away from moisture and heat. Store refrigerated. More general handling notes are in Storing Research Peptides.
Verify it yourself
Many laboratory reports include a verification key or QR code that points to the laboratory’s own record of the report. Where one is printed, use it. If you have a question about a certificate, email us with the product name and batch number.
Research use only
Everything we sell is intended for laboratory research use only. Nothing on this page is advice about use outside a laboratory.
Browse the COA library or shop research peptides.
