Not all research peptide suppliers hold themselves to the same standard, and the differences are not cosmetic — they determine whether you can trust the identity and purity of the material you receive. Use this checklist to evaluate any vendor before you order. It is written around one principle: a supplier should be able to prove what they sell, per lot, with independent data.
1. A certificate of analysis for every lot
The single most important signal. A serious supplier publishes a certificate of analysis (COA) tied to a specific batch number — not one averaged figure for the whole catalogue. Purity and identity are properties of an individual lot, so a single catalogue-wide percentage tells you nothing about the vial in your hand. If you can’t find a per-lot COA, treat every other claim with skepticism.
2. Independent, accredited third-party testing
Testing should be performed by an independent laboratory with a recognized accreditation — ISO/IEC 17025 is the international standard for testing competence — not by the seller’s own unnamed “in-house” process. An accredited third party has no stake in the result. Look for the laboratory to be named on the certificate.
3. Both identity and purity, by defined methods
A complete COA answers two separate questions. Identity — is this the correct molecule? — is confirmed by mass spectrometry. Purity — how much of the sample is the target compound? — is measured by HPLC-UV. A purity figure with no identity confirmation, or vice versa, is only half the picture.
4. Lot-level verification you can check yourself
You should be able to match the certificate to the exact vial you received, using the lot number on the label. A supplier that lets you verify a lot independently is one confident in its documentation.
5. Honest, research-use-only framing
Material sold for laboratory research should be described as exactly that: identity, classification, purity, and documentation — not outcomes. A supplier that makes human-use or effect claims is telling you it does not understand (or does not respect) the category it operates in. Clear research-use-only labeling and mechanism-only product descriptions are a mark of a serious operation.
6. A real business behind the catalogue
Complete legal pages, a consistent business identity and contact details, clear shipping and returns terms, and proper scientific naming (INN names and CAS registry numbers) all indicate a supplier operating as a real company rather than an anonymous storefront.
How Equora measures up
Equora is built around this checklist. Every lot is analyzed by independent, ISO/IEC 17025-accredited U.S. laboratories — see our Lab Testing & Analytical Methodology page for how it’s done, and how to read a certificate of analysis. The certificates themselves are published on the Lab Reports page, and any lot can be confirmed by its number on the Verify a Lot page.
For research use only
All materials supplied by Equora are for research use only. Not for human or veterinary use; not for diagnostic or therapeutic use. This checklist concerns documentation and quality standards and makes no claim regarding any effect, application, or outcome of any compound.