Stop guessing what's in the vial.
A free 6-page guide for researchers: how to read a peptide COA — purity, HPLC chromatograms, mass spec, and the red flags most suppliers hope you miss.
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Read any COA with confidence
Read HPLC purity like an analyst
What area % really means, and when 98.5% vs 99.4% actually matters for your work.
Verify identity with mass spec
Why purity without mass confirmation is an assumption, not a result.
Batch-specific vs. generic COAs
The single distinction that determines whether a COA means anything at all.
A printable 1-page checklist
Tape it to the lab wall and vet any supplier in minutes.
What's inside
Eight short sections — written for researchers, not marketers.
- 1What a COA is — and what it is not
- 2Purity: the headline number, explained
- 3Reading an HPLC chromatogram, peak by peak
- 4Mass spectrometry: confirming identity
- 5Quantity, appearance & sterility
- 6Batch-specific vs. generic COAs
- 77 red flags in a COA
- 8Your one-page checklist
Questions
Is it really free?
Yes. No purchase, no trial, no catch — just an email address so we can send the PDF.
Who is this guide for?
Researchers who buy or evaluate research-grade peptides and want to read Certificates of Analysis with confidence.
Will you spam me?
No. You’ll get the guide plus occasional research and lab-testing updates. Every email has a one-click unsubscribe.
Do you sell my data?
Never. Your email stays with NUPEPS.
All NUPEPS products are sold strictly for laboratory research use. Not for human or veterinary use.