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How testing works at DualCore, what a Certificate of Analysis actually proves, how to read one, and how to check any supplier’s — including ours.
Four stages. Where testing is commissioned, this is the process the documentation follows.
A production run arrives and is held on receipt. Where testing has been commissioned for that run, material is not released while it is in quarantine.
Where testing is commissioned, a sample goes to an independent laboratory and the report is recorded against that production run.
The report is reviewed against the specification for that compound. A run that does not meet it is not quietly listed at a discount — it does not enter the catalog.
Where a certificate is issued it is published in the COA Library.
What a Certificate of Analysis reports, where testing has been commissioned.
Confirmation that the material is the compound named on the label, rather than something with a similar appearance and a different molecular weight. Identity is the check that fails loudest when a supply chain has a problem.
What proportion of the material is the target compound and what proportion is everything else. Purity is the number most often quoted and least often evidenced, which is why it belongs on a report rather than in a headline.
Last updated 1 September 2026
Testing documentation is available for select products and lots. Where available, Certificates of Analysis can be viewed in our COA Library.
Where analysis is commissioned it is carried out by a laboratory independent of DualCore Peptides, and certificates are published unaltered.
A certificate is a short document and most of it is administrative. Four things on it carry the weight, and they are worth checking in this order.
First, the lot or batch number the certificate is issued against. Second, the date, which tells you when the material was characterised rather than when it was made. Third, the identity result, which confirms the compound is what the label says. Fourth, the purity figure and the method used to reach it, because a purity number with no stated method is a number with no meaning.
Apply the same six checks to every supplier you buy from. They are cheap to run and they eliminate most of the field.
Ask for the certificate for the specific lot you would receive, not a sample certificate. Confirm the analysis was run by a laboratory other than the supplier. Check the date. Check that the compound named on the report is the compound you ordered, at the presentation you ordered. Ask what happens to a production run that fails. And ask a question the supplier cannot answer from a script — the response to that tells you more than the certificate does.
If DualCore fails any of these, we would rather you told us than went quiet. Email support@dualcorepeptides.com with your order number.
The COA Library lists the certificates we hold. If you cannot find one for what you ordered, email us with your order number and we will confirm what is available.
The COA Library lists the certificates we hold. If you cannot find one for what you ordered, email us with your order number and we will confirm what is available.
The COA Library lists the certificates we hold. If you cannot find one for what you ordered, email us with your order number and we will confirm what is available.
