Research peptides, explained in plain language.
Short, sourced summaries of commonly studied peptides and a checklist for judging a supplier’s lab testing. For laboratory research only.
Browse the referenceHow to read a COACompound reference
Each entry describes what the published research literature says. Nothing here is a recommendation for human or animal use.
How to read a certificate of analysis
A COA is only useful if you know what to look for. Check these before trusting any supplier, ours included.
- Lot number matches your vial. A generic COA that isn’t tied to a lot number tells you nothing about what you received.
- Purity by HPLC. Look for the chromatogram, not just a percentage. One dominant peak is what you want.
- Identity by mass spectrometry. The measured molecular weight should match the expected weight for that peptide.
- Independent lab. Third-party testing carries more weight than in-house results. Confirm the lab’s name and that the report can be verified.
- Endotoxin and sterility screening. Often skipped by suppliers. Ask whether it was tested and by whom.
- Test date. Recent testing on the current lot, not a report from years ago.
Featured supplier: Apollo Peptide Sciences
We list Apollo Peptide Sciences as a supplier of research-grade peptides. We earn a commission if you buy through our links, at no extra cost to you.
What to know
- U.S.-based supplier of research-use-only peptides
- Third-party lab testing, with reports available by lot
- Catalog focused on lyophilized peptides and bacteriostatic water
- Free shipping threshold on larger orders (check current terms)
Do your own check. Compare any supplier’s COAs using the checklist above. Offers, pricing, and policies change, so confirm details on the supplier’s own site.
Research use only. Products discussed on this site are sold for in-vitro laboratory research. They are not approved by the FDA for human or veterinary use, and nothing here is medical advice. We do not publish dosing or administration guidance.