Reading a Certificate of Analysis

Every Peptides.li product comes with a Certificate of Analysis (CoA) from an independent third-party laboratory. This document is your proof of quality and a critical resource for your research records. But what exactly should you look for in a CoA?

What Is a Certificate of Analysis?

A Certificate of Analysis is a formal report documenting the quality and purity of a specific batch of a product. For research peptides, the CoA includes results from multiple analytical tests performed by an independent laboratory. This third-party verification is essential for research integrity.

Key Sections in a Peptide CoA

Identity Confirmation: This section uses techniques like mass spectrometry to confirm that the compound is actually what it claims to be. The CoA will show the molecular weight and other identifying characteristics. Verify that these match the specification for the peptide you ordered.

Purity Analysis: HPLC (High-Performance Liquid Chromatography) is the standard method for measuring peptide purity. Look for a purity percentage—Peptides.li targets 98% or higher. The HPLC results should show one major peak corresponding to your peptide, with any byproducts or related impurities accounting for the remaining percentage.

Microbial Testing: This section confirms that the peptide is free from bacterial contamination and meets safety standards for handling. Terms like “endotoxin testing” and “sterility testing” may appear. These are critical safety measures for research compounds.

A Certificate of Analysis is more than a piece of paper—it’s your proof of quality and a critical component of research transparency. Treat it as an essential part of your research documentation.