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How to check a peptide COA: five simple checks

Check the lab’s original, the seller’s copy, and your batch. Learn which differences need an explanation and what a genuine report still cannot prove.

2 min read · Written by PeptideWhy · Published · Updated

A lab logo and a purity percentage are easy to display. Here is what to check before trusting a COA.

Five checks you can make

  1. Full report: Get the complete document, not just a cropped “99%” image.
  2. Real lab record: Find the lab’s own site independently. Use its verification tool, or contact it using its published details.
  3. Matching original: Compare the report number, compound, date, and results with the seller’s copy.
  4. Matching batch: Compare the vial’s full name and batch code with the report. Ask how the sample and report connect to that seller.
  5. Relevant tests: Find separate results for each claim. Purity, mg, identity, sterility, and endotoxins are different questions.

What would make me pause?

  • The original report has different results from the screenshot.
  • The verification key opens a different compound or batch.
  • The seller cannot explain a mismatched batch or sample-submitter name.
  • A purity result is presented as proof of sterility or a safe human dose.
  • There is only a logo, an image, or a generic old report with no traceable record.

These are reasons to ask questions, not proof that every discrepancy is fraud. If the lab corrects or reissues a report, ask it to confirm the current version.

What if there is no online checker?

That alone does not establish that a report is fake. Ask the lab directly whether it issued the document. For a Janoshik report, the lab’s own verification page accepts a task number and unique key.

What can a genuine report still miss?

It describes the submitted sample and tests performed. It does not establish every vial’s contents, suitable shipping and storage, or safety in a person. Read the COA walkthrough for the details.

JD BioWorks’ COA article and HPLC graph article explain the fields and graph. Verify the underlying report separately.

Wondering whether a passing test proves the vial sterile? Read what a COA can and cannot show about sterility and endotoxins.

A separate scientific review date has not been recorded for this article. How we publish and correct sources →

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