Guides
Research peptide testing & COA guides
How to read the documents that come with research material, and what each of them can and cannot tell you.
Research use only. Not for human or veterinary use.
How to read a peptide Certificate of Analysis
What each section of a peptide Certificate of Analysis means, how to check one is genuine, and the seven things worth verifying before you buy.
Article updated 2026-09-24 · Read the guide →
What HPLC-MS actually measures, and what it doesn't
What HPLC and mass spectrometry each measure on a peptide certificate, how the purity number is produced, and the things the method cannot see at all.
Article updated 2026-09-24 · Read the guide →
Why peptides ship freeze-dried
What lyophilisation does, why a peptide in solution degrades and a dry one does not, and what 'stable in transit without a cold chain' actually means.
Article updated 2026-09-24 · Read the guide →
How to vet a research peptide vendor
The criteria independent reviewers actually weight when ranking peptide suppliers, the questions worth asking, and the answers that should end a conversation.
Article updated 2026-09-24 · Read the guide →
Net peptide content and purity are not the same number
Why a vial can be 99% pure and still contain less peptide than the label says, what counterions and residual water weigh, and why almost nobody publishes content.
Article updated 2026-09-24 · Read the guide →