How to Verify a Research Peptide Batch by Its Lot Number
A forwarded image of a certificate proves very little — it can be reused, edited, or belong to a different batch entirely. Independent batch verification by lot number is the stronger check. This guide explains how it works and what to look for.
Why a forwarded COA image isn't enough
The most common way suppliers share documentation is by emailing a COA image or PDF. The problem: an image is trivially reusable across batches, can be edited, and gives you no way to confirm it actually corresponds to the vial in your hand. A genuine, batch-specific record that you look up yourself is far harder to fake.
What independent batch verification means
Batch (lot) verification means checking a specific production run by the unique lot number printed on its vial or label — against a record the supplier publishes, not one they forward to you. A good system returns that batch's certificate of analysis, HPLC purity, and identity (mass-spectrometry) status keyed to the lot number, so the document is tied to the physical vial rather than floating free.
How to verify a batch on Index Peptides
Find the batch / lot number on your vial or its certificate, then enter it on the verify page. The record returned shows that batch's COA, HPLC purity, LC-MS identity confirmation (expected versus detected mass), test date and storage conditions. Because the lookup is keyed to the lot number, the documentation you see is the documentation for your specific vial.
What a complete batch record shows
Lot / batch number; compound and format; HPLC purity (with the chromatogram available); LC-MS identity (expected vs detected mass); the testing party and date; and storage conditions. A record missing the identity result, or with no lot number, is weaker — see our guide on reading a certificate of analysis for the full field-by-field detail.
Red flags
No lot number on the vial or paperwork; the same certificate appearing across different batches; a purity figure with no chromatogram and no identity (MS) result; or a supplier that will only forward an image and offers no way to check a batch independently. Public, lookup-by-lot-number verification is the standard that removes the guesswork.
Frequently asked questions
Why isn't an emailed COA good enough?
An emailed image or PDF can be reused across batches, edited, or belong to a different lot entirely. A record you look up yourself by lot number is tied to your specific vial and much harder to fake.
Where do I find the lot number?
It's printed on the vial or its certificate. Enter it on the verify page to see that batch's COA, HPLC purity and LC-MS identity status.
What if a batch doesn't appear?
Check the number on your vial or certificate, then contact us with the lot number and we'll confirm it. Every released batch should be checkable by its lot number.
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