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Almost every research peptide sold in the UK comes with a certificate of analysis, and they tend to look alike: a logo, a chart, a purity figure in the high nineties. What isn't always obvious is who produced them, and that matters more than anything printed on the page.
Produced by the factory that made the peptide, often in its own lab. They're the most common document in the market and a reasonable starting point, but the manufacturer is checking its own work.
Produced by a laboratory the manufacturer pays, often one the buyer has never heard of and can't easily look up.
Produced by a laboratory that tests for anyone, has no stake in the result, and is well known enough that you can check who it is.
An independent laboratory accepts samples from anyone, charges the same published prices whoever sends them, and has nothing riding on whether a result is good or bad. Janoshik, in the Czech Republic, is the best-known example in the research peptide market. Its reports include a photograph of the sample tested, which makes them easy to match to a product.
Redacted certificates are normal
Resellers often black out the manufacturer's name on a certificate so competitors can't go straight to their source. That's standard commercial practice, not a warning sign, provided the laboratory is named, the rest of the document is untouched, and the seller is open about it.
The certificates we supply are Janoshik reports. Most are our suppliers' reports, with the supplier's details redacted for commercial reasons, and we always tell you that's what they are. The vial in the certificate photo matches the vial we send.
We've also sent our own stock to Janoshik. Our BPC-157 came back at 99.892% purity with 5.71mg measured on a 5mg vial, published in full on our testing page. As the business grows, every batch will get its own Janoshik test.
All products supplied by Zenic Labs are for laboratory research use only and are not for human or veterinary consumption. No health, dosing or therapeutic claims are made about any product we sell.
Also worth reading
Eight things you can check yourself before ordering from any UK peptide supplier, including us. Most take under a minute.
How white label and wholesale research peptides work in the UK: labels, documentation, traceability, margins and the questions to ask a supplier.
What a lot number on a peptide vial actually tells you, how to check one, and why it matters more than any certificate if something goes wrong.