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Demand the certificate
Ask for the Certificate of Analysis for the exact lot you would receive — not a generic sample sheet. If a seller cannot produce a batch-specific COA, there is nothing to verify and the conversation ends here.
Verify before you buy
Attestory is a verification registry. Before money changes hands, a research peptide should be verified against a real Certificate of Analysis — an independent lab document proving purity, identity, and the exact batch. This is the framework for doing it properly. Information only — we do not sell.
Verification is not a feeling — it is a short, repeatable protocol. Run these three checks in order. If any one fails, the batch is unverified and the answer is no.
Ask for the Certificate of Analysis for the exact lot you would receive — not a generic sample sheet. If a seller cannot produce a batch-specific COA, there is nothing to verify and the conversation ends here.
Confirm the certificate comes from an independent, accredited laboratory — ideally ISO/IEC 17025 — with a name, an address, and a verifiable accreditation number. A self-issued vendor certificate does not count.
Look for HPLC purity with the chromatogram attached and LC-MS identity with the mass spectrum shown. A bare percentage or a missing mass spectrum is not proof — it is a claim.
Treat every purchase like an entry in a register. A batch is only entered as verified once each line below is satisfied. This is the checklist an auditor would keep.
The COA is issued by a named third-party laboratory, ideally ISO/IEC 17025 accredited — not by the seller.
the certificate is self-issued or the lab is unnamed.The exact lot number on the certificate matches the number printed on the label of the material you would receive.
the lot number is missing, generic, or does not match.Purity is reported by HPLC — commonly ≥98% for research work — with the chromatogram attached so the main peak is visible.
a bare percentage is shown with no chromatogram.Molecular identity is confirmed by LC-MS, with the found mass matching the expected value and the spectrum shown.
no mass spectrum is provided — purity alone can be the wrong molecule.Water content (Karl Fischer) and endotoxin (LAL) are stated, completing the composition picture.
these fields are quietly omitted.The certificate carries an analyst signature or stamp and an analysis date contemporary with manufacture.
it is unsigned or recycled across multiple batches.The gap between a verified batch and an unverified one is not subtle once you know where to look. Compare the two columns before you trust any document.
A complete certificate reports four things by four methods: purity, identity, water, and endotoxin. Any one missing leaves the record incomplete.
The proportion of target compound, with the chromatogram attached so the main peak and its area are visible.
Molecular mass confirmation proving the compound is what the label claims — not an analogue or substitute.
Residual water content, which lowers the true net peptide mass in lyophilized material.
Bacterial endotoxin in EU/mg — relevant for any cell-culture or in-vivo research use.
The entire value of a certificate rests on the independence of whoever issued it. This is the single most important line in the record.
A seller issuing its own COA is grading its own work. In-house quality control is not the same as an independent, accredited laboratory, and it cannot be treated as verification.
Only a third-party lab — ideally ISO/IEC 17025 accredited — produces a certificate free of commercial incentive, using validated and auditable methods. Independent testing services exist precisely to close this gap: they analyse a submitted sample and report the result without a stake in the sale.
Framing: ISO/IEC 17025 · WHO quality principles · USP methods. Updated July 2026.
Verifying a peptide means refusing to trust a label and instead confirming a real Certificate of Analysis for the exact batch: an independent, accredited laboratory reporting HPLC purity, LC-MS identity, and the matching lot number. If a seller cannot produce that record, there is nothing to verify.
Only an independent third-party laboratory — ideally ISO/IEC 17025 accredited — can issue a COA free of conflict of interest. A certificate written by the seller of the product is not verification; it is marketing, because the seller is grading its own work.
A verified certificate names the compound and its sequence, references the exact lot number, reports purity by HPLC with the chromatogram attached, confirms identity by LC-MS with the mass spectrum, and states water content and endotoxin. It is signed by a named analyst at an accredited lab.
The clearest red flags are a self-issued certificate, a missing or mismatched lot number, a bare purity percentage with no chromatogram, absent LC-MS identity, and no verifiable accreditation. Any one of these means the batch is unverified.
No. Attestory is a verification registry and education resource. We do not sell products, do not capture email, and do not give medical advice. We teach how to verify a Certificate of Analysis before buying. Consult a licensed physician before considering any use.
The full verify-before-you-buy checklist: how to read a COA line by line, how to judge an independent ISO/IEC 17025 lab, and how to recognise a certificate that fails. Continue to the registry.
Peptides discussed here are research materials where applicable — not consumer goods and not approved medicines. Legal status varies by country. Attestory is an educational verification registry: nothing here recommends use, dose, or a source of supply, and nothing here is medical or legal advice. Anyone considering these substances should consult a licensed physician who can assess their individual situation.