A certificate of analysis (COA) is only worth something if you can confirm the lab actually ran that test. Janoshik Analytical, the independent lab most research-peptide vendors use, lets anyone check a report on its own website. Here is how to do it, what to compare, and the red flags that mean you should not trust the PDF you were sent.

Step 1: Get the task number and the key

Every Janoshik report has two identifiers: a task number (for example #149788) and a unique verification key (a 12-character code). Both are printed on the report. A vendor that is confident in its testing will publish both. If a vendor gives you a PDF or screenshot with no key, you cannot verify it.

Step 2: Enter both on Janoshik’s site

Go to janoshik.com/verify and enter the task number and the key. You are checking on the lab’s own website, so the vendor has no control over the result.

Step 3: Compare the details

Do not stop at “it’s real.” Check that what Janoshik confirms matches what you are buying:

• Compound. The report should name the exact peptide you are ordering, not a related one.
• Amount. A 10 mg vial should test close to 10 mg. A big gap means underfilled vials.
• Purity. Look for the HPLC purity percentage, and make sure it matches the number the vendor advertises.
• Test date. The test should be recent enough to cover the batch you will receive. A two-year-old report on a fast-moving product is a warning sign.

Red flags

• No task number or key on the report, or the vendor will not give them to you.
• The key works, but the compound, amount or date does not match the PDF.
• The same report is used for every strength or every product.
• “Janoshik tested” in the marketing, but no report you can check.
• Only a cropped screenshot, never the full report.

What a COA cannot tell you

A verified report proves a lab tested a sample from a batch. It cannot prove that the vial in your hands came from that batch. That is why experienced buyers favor vendors who publish a report for every batch and keep it current, and why some buyers send their own vial for independent testing. Both are reasonable. The point is to rely on evidence you can check, not on a vendor’s word.

How DelixLabs does it

Every batch we sell is tested by Janoshik, and we publish the task number and key for each one on our COA & test results page and on the product page. Check any of them yourself before you order.

See every batch’s task number and key →

FAQ

Do I need both the task number and the key?

Yes. Janoshik’s verification form asks for both. The key on its own is not enough.

Does a verified report mean the product is pure?

It means a sample from that batch tested at the reported purity and amount. Compare the compound, amount and date to what you are buying, and favor vendors who test every batch.

What if the vendor only has a PDF?

Ask for the task number and key. If they will not provide them, you are trusting the vendor, not the lab.

Switching from Peptide Sciences? See our guide to the best Peptide Sciences alternatives in 2026.

All products sold by DelixLabs are for laboratory research use only, not for human or veterinary use, and not evaluated by the FDA. DelixLabs is not affiliated with Janoshik Analytical.