Home / Quality & Lab Testing

Quality & Lab Testing

Every batch, third-party tested. Every kit, backed by a Certificate of Analysis. Here is how Pep Depot verifies what is in the vial.

In research supply, the only thing that matters is whether the compound in the vial is what the label says, at the purity the label claims. Pep Depot's answer is simple: independent third-party testing on every batch, documented in a Certificate of Analysis (COA) available for every kit we sell.

How Is Every Batch Tested?

Each production batch is sampled and sent to an independent third-party laboratory, not tested in-house, not self-certified. Analysis is performed using industry-standard methods:

HPLC (High-Performance Liquid Chromatography) to verify purity and detect impurities
Mass spectrometry to confirm the compound's identity and molecular weight

A batch that does not meet specification does not ship. There is no grading system and no seconds bin; it passes or it is rejected.

What Is a Certificate of Analysis?

A COA is the lab's formal report for a specific batch. It is the document that separates verified material from marketing claims. Every Pep Depot COA includes:

Anatomy of a Pep Depot COA

Compound identity The peptide name and sequence confirmation via mass spectrometry, matched against the expected molecular weight.