A Certificate of Analysis is the only objective evidence that a peptide is what it claims to be. This guide explains what HPLC and LC-MS actually measure, what a purity ≥98% looks like on a real chromatogram, and how to spot a certificate that has been altered or fabricated — field by field, with an annotated example.
Peptide verification — the full picture
Educational guides for anyone navigating peptides in Ireland. How to read a COA, spot counterfeits, and understand what medical supervision actually involves. No products, no prices.
Information site. We don't sell products and we don't give medical advice. Always consult a licensed healthcare professional.
All articles are educational. This site does not sell peptides or give medical advice. Regulator in Ireland: HPRA.
Safety
How to spot counterfeit peptides: 7 warning signs
Retatrutide is the most counterfeited GLP-1 peptide of 2026. From missing batch COAs to LC-MS mass discrepancies and packaging inconsistencies — seven concrete signals that something is not right, and a reference table to use when evaluating any source.
Safe use
Peptides under medical supervision: why it matters
GLP-1 peptides are potent compounds with contraindications, drug interactions, and documented side effects. This guide explains what a licensed doctor actually provides — from history review to titration and follow-up — and how the HPRA regulates these compounds in Ireland.