Transparency Report
The State of EU Peptide Testing 2026
This page covers our published laboratory reports. For research purposes only.
Testing window: 2026-03-31 → 2026-09-18
Why publish the unflattering results
A certificate of analysis is only worth what the testing behind it is worth — and worth far less if a vendor only shows you the reports that look good. The value of a third-party report comes precisely from the fact that the vendor didn't get to choose the number. When a supplier curates which lots they publish, they quietly convert independent testing back into a marketing claim.
CertaPeptides is a reseller. The original certificate identifies the issuing laboratory.
Published reports
Individual reported results
Reports with recorded purity below 99% are listed here. Open each original certificate for its method and test scope.
Methodology, in plain terms
Methods and reporting limits must be checked on each certificate. We therefore present individual reports without a shared purity average.
HPLC — how pure is it?
Reversed-phase high-performance liquid chromatography separates a peptide from its related impurities; purity is reported by area normalisation — every detectable peak integrated, the main peak expressed as a percentage of the total. This is the number researchers usually mean by "purity."
MS — is it the right molecule?
Mass spectrometry confirms identity by measuring the molecule's mass-to-charge ratio against its known molecular weight. High purity of the wrong compound is worthless; MS is what rules that out.
Heavy metals — is it contaminated?
A heavy-metals analysis checks for arsenic, cadmium, lead and mercury, and the certificate states the result for each element.
Content quantification answers a fourth question — how many milligrams are actually in the vial — which is why we report it separately and never fold it into a purity average. A blend with three actives has no single purity figure at all.
About the lab, stated precisely
These reports cover selected lots. CertaPeptides is a reseller, does not perform laboratory testing in-house and does not claim independent testing of every vial.
What to demand from any EU supplier
Whether or not you buy from us, these are the questions that separate a real testing programme from a marketing one. Use them on every vendor.
A report you can open at the lab, not a PDF they typed
A verification link to the testing lab's own portal cannot be edited after the fact. A re-typed or screenshotted COA can. Insist on the former.
The lot number on your vial, matched to a report
A report for "some batch" proves nothing about your batch. Ask how a code printed on your vial maps to a specific published report.
At least one result they'd rather not show
A wall of flawless certificates is a red flag, not a green one. Real testing produces the occasional disappointing number. Ask to see theirs.
Honest scope — purity is not identity is not heavy metals
A purity percentage doesn't tell you the molecule is correct or the metals are clean. A supplier who blurs the three is overstating their COA.
Questions researchers ask
Is this an EU-wide market survey?
No, and we won't dress it up as one. It is an aggregate of our own published laboratory reports — first-hand data from lots we tested, not a survey of other suppliers. We frame it as a European reference because the underlying transparency standard travels: any EU buyer can apply the same checklist to any vendor.
Why do some entries have no purity percentage?
Blends with multiple actives and bacteriostatic water are sent for content quantification — how many milligrams of each component are present — not single-compound purity. There is no honest way to express a three-active blend as one purity number, so we report and count those separately.
Do you test every batch?
No. Independent testing runs on selected lots on a rolling cycle, and supplier batch specifications cover every product line in between. We don't claim per-vial third-party testing, because we don't do it — anyone who claims it for an entire catalogue is overstating.
See the underlying reports
All CertaPeptides products are supplied strictly for laboratory research purposes only. Nothing here is a medical claim, and none of these compounds are for human or veterinary use.