Peptide Library

Research Peptide COAs: What They Really Mean and What to Actually Look For

A Certificate of Analysis (COA) is a laboratory report documenting test results for a specific batch of material and whether those results meet defined specifications. In the research peptide market, COAs have been repurposed as marketing documents dressed up with graphs, color coding, and polished layouts that signal credibility without necessarily delivering it. What actually matters on a COA is not visual presentation but verifiable lot linkage, independent lab identity, and testing that goes beyond basic identity and purity to include endotoxins, heavy metals, microbial content, TFA residuals, and pH.