Blog
Informational guides for research samples — not medical advice.
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What a certificate of analysis (COA) should show — and red flags to look for
A useful COA ties results to a specific lot, names the methods, and lets you verify who tested the sample.
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HPLC purity vs net peptide content: why the two numbers differ
High HPLC purity does not mean the vial is 100% peptide by weight — salts, counterions and moisture also affect the numbers.