You are looking at two Certificates of Analysis from two different vials, and the reports come from two different labs. One says Janoshik. One says Chromate. Now you are trying to work out whether the lab name changes how much you can trust the number.
It is a fair thing to ask, so here is a plain comparison of the two and, more importantly, how to verify either report yourself.
Two independent labs, same job
Janoshik Analytical and Chromate are both independent third-party labs that test research peptides. The word that matters in that sentence is independent. Neither one sells the compounds it tests, which is the whole reason a third-party report carries more weight than a number the seller prints on its own homepage.
Janoshik is the name you see most often on research peptide COAs, and our Janoshik testing guide covers what it reports in detail. Chromate is another lab that runs the same core analyses. Both give you an outside opinion on what is in the vial, which is the point.
What each lab reports
The core tests are the same across serious labs, because the questions a researcher needs answered are the same. How pure is the sample, and is it the right compound.
| Item | Janoshik | Chromate |
|---|---|---|
| Type | Independent third-party lab | Independent third-party lab |
| Purity test | HPLC, reported as a percentage | HPLC, reported as a percentage |
| Identity test | Mass spectrometry | Mass spectrometry |
| Report format | PDF with a report or order number | PDF with a report or test number |
| How to verify | Match the report number, contact the lab | Match the report number, contact the lab |
The details on a report can differ in layout, but the load-bearing parts are the HPLC purity figure and the mass spec identity confirmation. Our guide to HPLC purity explains what that percentage actually measures if you want the background.
How to verify a report, whichever lab ran it
This is the part that matters more than the lab name. A COA is only useful if it is real and if it belongs to the vial in your hand.
Run the same check on a Janoshik report and a Chromate report both.
- Confirm the report ties to your specific lot or batch number, not a different one.
- Look for both the HPLC purity figure and the mass spectrometry result on the page. A purity number alone does not confirm identity.
- Check that the report carries a test or order number issued by the lab.
- Where the lab offers it, verify that number directly with the lab rather than trusting a screenshot.
A screenshot from some other batch is the oldest trick in the market. The routine above is how you avoid it. Our third-party testing guide walks through the full process.
Which lab should you trust
Both. The honest answer is that the lab name is not the deciding factor. A real report from either Janoshik or Chromate, tied to your lot and showing purity and identity together, is worth far more than a slick page with no lab behind it at all.
What actually separates sources is whether they show you the report before you pay, and whether the numbers are documented per batch. You can see a live Certificate of Analysis and judge the format for yourself.
Read the report, not the logo. A third-party number you can verify beats a brand name every time.
All products are for laboratory research only. Not for human or veterinary use.
Research Use Only
This article is provided for educational purposes. All peptides discussed are sold for research use only and are not intended for human consumption or therapeutic use.