Peps101  /  Checking a COA
VERIFICATION  /  LAB REPORTS

Checking a COA

A certificate of analysis is a lab report on one sample from one batch. It tells you what was in the vial the lab tested — which is only useful to you if you can confirm the report is real and that it refers to your batch. Here's how to do both.

Verification lookup

What each field means

Compound name
Should match what you ordered exactly. A blend should list its components.
Batch / lot number
The single most important field. It must match the number printed on your vial. If it doesn't, the report is a manufacturer reference document for a different batch, not yours.
HPLC purity
The headline percentage, measured by high-performance liquid chromatography and usually read at 214 nm. It's the proportion of total peak area that is your target compound. Research-grade material is typically specified at 98% or above.
Mass spectrometry
Confirms identity rather than purity. The observed molecular mass should sit within a tight tolerance of the theoretical mass for that peptide.
Measured content
How much peptide was actually in the vial, in mg. This is the number that matters for your dosing arithmetic — a vial labelled 10 mg that assays at 9.1 mg changes every calculation on this site.
Date of analysis
Should be close to the batch production date, not years old.
Endotoxin, heavy metals, sterility
Only appear when that expanded testing was specifically ordered. Their absence isn't a red flag on its own, but it does mean nobody checked.

Red flags

  • No reference number, or a number that returns nothing on the lab's own verification portal.
  • Batch number on the report doesn't match the batch printed on your vial.
  • A purity figure quoted without the chromatogram that produced it.
  • A PDF that shows signs of editing — mismatched fonts, misaligned text, inconsistent decimal places.
  • The same certificate reused across several different batches or products.
  • A verification link that points anywhere other than the laboratory's own domain.
  • Purity stated to more decimal places than the method can support.
  • The report confirms identity and purity but not measured content, while the vendor advertises an exact milligram figure.

Worth keeping in proportion: a verified COA tells you the sample the lab received was what it claimed to be. It says nothing about what happened to your specific vial afterwards — filling, storage or shipping — and it isn't a safety assessment of the compound itself.

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