Buyer education
Quality & Testing
Independent educational resources to help international buyers review supplier analytical documentation, understand common test methods, and plan batch-specific verification. These guides do not replace your quality system or qualified laboratory advice.
Guides
How to Verify a Laboratory
Check accreditation directories, review report fields, and spot common red flags before accepting a third-party COA.
Read guide →How to Read a COA
Understand standard Certificate of Analysis sections for research peptides and what each field is meant to document.
Read guide →HPLC vs LC-MS
Compare what HPLC purity and LC-MS identity tests measure, and when each is typically expected.
Read guide →Peptide Content vs Purity
Learn why net peptide content and chromatographic purity are different values that should not be conflated.
Read guide →Reference Standards
Educational overview of how reference standards support identity and quantitation in peptide testing.
Read guide →Testing Checklist
A practical pre-release checklist for reviewing supplier analytical packages on research peptide orders.
Read guide →
Platform role
Peptide From China publishes procurement education and directory listings. We do not issue COAs, operate testing laboratories, or certify supplier batches. Use these guides alongside your internal qualification process and, when needed, independent third-party testing.
Browse official accreditation directories · How we label supplier listings
For laboratory research and analytical use only. Not for human consumption. Not intended to diagnose, treat, cure, or prevent any disease.