Peptide Testing and Label Accuracy
Peptide testing explained: what HPLC and mass spectrometry show, what a certificate of analysis misses, and mislabelled vials users found.
Anonymous user report. Not medical advice. Peptides discussed are not FDA-approved for the uses described. Editorial process →
Short answer
Research-labelled peptides are not made or checked under drug-manufacturing rules, so the only check is whatever testing someone pays for. HPLC estimates purity (how much of the sample is the main peak); mass spectrometry confirms the molecule's identity; quantity testing checks how much is actually in the vial. None of these routinely checks sterility, endotoxins or heavy metals — the things that cause infections and reactions. A clean test is not an approval. This page does not recommend sellers or labs. Peptide Confessions does not publish dosing, timing, injection or sourcing guidance.
| Test | Answers | Does not answer |
|---|---|---|
| HPLC | Roughly how pure the sample is | What the impurities are; sterility |
| Mass spectrometry | Is it the right molecule? | How much is in the vial |
| Quantity / content | How many mg are really there | Contamination |
| Endotoxin / sterility | Bacterial contamination | Usually not done for research vials |
What users found
In #527 a blend vial sent for testing held far more GHK-Cu than its label claimed — the amount in a vial may not be the amount on it. Other confessions describe products that gelled, looked wrong, or did nothing, and writers often cannot tell whether a non-result was the peptide or the product. See KLOW and common mistakes.
Related topics
community guides:
More confessions from the archive
Community Q&A
- What is a peptide certificate of analysis (COA)?
- A document reporting test results for a batch, usually HPLC purity and mass-spec identity. It may not reflect the vial you have, and rarely covers sterility.
- Does a pure test mean a peptide is safe?
- No. Purity and identity tests do not check sterility or endotoxins, and an unapproved compound has no established safety profile.
- Can peptide vials be mislabelled?
- Yes. One test in this archive (#527) found a very different amount from the label.
- Does Peptide Confessions recommend testing labs or sellers?
- No. We do not publish sourcing or vendor guidance.
Anonymous first-hand reports plus sourced context — educational only, not medical advice. Editorial policy & corrections.