A certificate of analysis is only useful if you can check it. Anyone can put a picture of a lab report on a website. What separates a real document from a decoration is whether the details on it survive comparison with the vial in your hand. This page tells you exactly what to look at, in the order that catches problems.
1. Match the compound, not the logo
Read the analyte line on the report and compare it with the label on the vial. A report that names tirzepatide is not evidence for a retatrutide vial, and a report for a blend is not evidence for the single compounds sold beside it. If the seller ships you a blend report for a standalone vial, the report does not cover your product.
2. Match the strength
The content figure on the report is the amount the laboratory measured in that sample. If a report shows 10 mg and you bought a 15 mg vial, the report does not apply to your vial. This is the most common gap we see in this market, and it is the one buyers miss most often.
3. Match the batch or lot code
A report should identify the sample it tested. If your vial carries a lot code, the report should let you connect the two. A lot code that appears only on the seller's own documents, and never in the laboratory's own field, is a house code, not a tested batch identifier. That distinction matters if you ever need to make a claim.
4. Check the dates
Read the testing ordered, sample received and analysis conducted dates. A report dated two years ago describes a sample from two years ago. If those dates look recent but the paper, font or stamp looks old, or the dates do not align with the task number sequence, ask for the original file. Altered dates are the single clearest sign that a document has been edited.
5. Use the laboratory's own verification
Janoshik Analytical reports carry a unique verification key and a task number. Enter both on the laboratory's own website, not on the seller's site. A QR code that leads back to the shop proves that the shop wrote a page; it does not prove a laboratory said anything. The laboratory's verification page is the only place that answers the question.
6. Understand what the report measures
- Purity is usually the area percentage of the target peak in the chromatogram. 99% purity describes the composition of the powder that was tested, not the dose you will use. It is not a safety statement.
- Content or mass is how much material the laboratory found in the vial. A vial labelled 10 mg that contains 6 mg is a real problem, and purity figures will not reveal it.
- Methods matter. Some reports name the technique used, some only state a test description. If no method is stated, you are reading a result without the means to judge it.
- Missing columns matter. A report with no purity column verifies identity or content only. Treat it that way.
7. Age and relevance
A report is a snapshot of one sample at one time. It cannot promise what is inside a vial produced later. If a seller cannot offer a report matching the lot you are buying, the honest position is that your lot is untested. That is a normal situation in this market. Pretending otherwise is not.
Red flags worth walking away from
- The manufacturer or brand name is written over the laboratory's own field.
- A house lot code is printed inside the laboratory's batch field.
- The analysis dates do not match the task number or the rest of the document.
- The verification key has been removed or covered.
- Purity is claimed for a product with no report, or with a report for a different strength.
- Human use, dosing or weight loss is promised anywhere on the same site.
A worked example
We published our own documentation position in the four certificates study, including the parts that do not flatter us. Use it as a worked example of the checks above.
What we do here
We publish what we actually hold, including the parts that are unflattering. Our certificate pages carry the figures and the analysis dates from the reports we have, state which products those reports do not cover, and explain their limits. We sell to a 99%+ purity standard and refund in full if your own independent test on your vial comes back below 99%. We would rather lose a sale than hand you a decorated document.
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For laboratory research use only. Not for human or veterinary use, and not a licensed medicine.