COA checklist

Peptide COA Checklist

A Certificate of Analysis can be useful, but only if it is current, lot-specific, readable, and aligned with the product claim.

Research supplier due diligence only: This page is educational. It is not medical advice, buying advice, dosing guidance, a safety guarantee, or a recommendation to use any compound. Affiliate links may generate commission.

Lot match

The COA should match the product and lot shown on the supplier page or label. If the lot is missing, the document is harder to evaluate.

Testing date and lab

Recent testing from an identifiable lab is stronger than an old image, cropped screenshot, or anonymous document.

Method and result

Look for clear method notes and reported values. “Tested” is vague unless the document explains what was measured.

Red-flag copy

Be cautious when a COA is paired with extreme claims, human-use instructions, or guaranteed outcome language.

Checklist

COA review checklist

  1. Match compound name, form, and lot number.
  2. Check test date, lab identity, and document completeness.
  3. Review purity/content numbers without treating them as a safety guarantee.
  4. Watch for copied, cropped, or low-resolution images.
  5. Save notes before comparing multiple sources.
Compare research supplier transparencyReview documentation, posted testing, and claim boundaries →View posted COA sourcesUse the checklist before trusting purity or content claims →See trusted sourcesAffiliate disclosure applies; independently verify every source →

FAQ

Frequently asked questions

What is the first thing to check on a peptide COA?

Start by matching the compound name, lot number, testing date, and supplier page. A COA is weaker if it cannot be tied to the exact lot being evaluated.

Does a purity percentage prove a product is safe?

No. A purity percentage is not a safety guarantee, medical recommendation, or proof of appropriate use. It is only one document to review during research supplier due diligence.

Why do testing methods like HPLC or LC-MS matter?

Testing methods help explain what was measured. Purity, identity, impurities, and content claims can require different methods and should be interpreted carefully.

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