BetterBio Synthesis products and educational materials are intended for Research Use Only. This article is for laboratory education and quality-literacy purposes only. It is not medical advice, does not recommend human use, and does not provide dosing, administration, treatment, diagnosis, cure, or prevention guidance. Research materials are not for human consumption.

A peptide Certificate of Analysis can look simple at first glance. There is often a product name, a lot number, a purity percentage, a chromatogram, a mass value, and a few signatures or dates. The danger is that a single number can feel like the whole story. It is not.

For research peptides, two of the most common analytical terms are HPLC and mass spectrometry. They are sometimes treated like interchangeable proof of quality, but they answer different questions. HPLC is most often used to estimate how much of the detected material behaves like the main peptide peak under a specific chromatographic method. Mass spectrometry is used to support identity by measuring molecular mass and, in more advanced workflows, fragment information related to structure or sequence.