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How to Read a Certificate of Analysis (and Spot Red Flags)

A Certificate of Analysis is only as good as the lab behind it. Learn what every section means, which numbers matter most, and the warning signs that a COA might not be worth the paper it is printed on.

PeptideWatchdog Team · Feb 14, 2026 · 8 min read

🔬 Testing & Purity

HPLC Purity Testing Explained: What the Numbers Actually Mean

High-Performance Liquid Chromatography sounds complex, but the output is straightforward once you know what to look for.

PeptideWatchdog Team · Feb 08, 2026 · 6 min read

⚖ Testing & Purity

Why Mass Spec Matters: The Identity Problem in Research Peptides

A peptide can test 99% pure and still be the wrong compound entirely. Here is how identity confirmation catches what purity testing misses.

PeptideWatchdog Team · Jan 22, 2026 · 7 min read

PeptideWatchdog Blog

How to Read a Certificate of Analysis (and Spot Red Flags)

HPLC Purity Testing Explained: What the Numbers Actually Mean

Why Mass Spec Matters: The Identity Problem in Research Peptides