Sourcing & Quality
How to evaluate the quality, purity, and identity of a peptide — the questions buyers actually ask. Educational only; we name no vendors as recommendations and link to nothing for sale.
Legal & safety note
Many peptides are research-only or regulated. “Research use only” labeling is not a legal shield and does not guarantee sterility, identity, or potency. See the Disclaimer and Regulatory & Legal Status.
In this section
- How to Read a CoA — Certificate of Analysis, explained
- HPLC vs Mass Spec — purity vs identity (“pure but wrong molecule”)
- Third-Party Testing — independent labs and batch verification
- Red Flags & Scams — how to spot fakes and fabricated CoAs
- Vendor & Purity Database — aggregated independent test results
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