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Most buyers check the purity figure on a certificate and never look at the small code printed on the back of the vial. That code is the lot number, and it does a job no certificate can do on its own: it connects the vial in your hand to a specific batch, and that batch to everything known about it.
A lot (or batch) is a quantity of product that came in together and is treated as one unit: same compound, same strength, same delivery. Every vial from that lot carries the same lot number. A new delivery of the same product is a new lot, with a new number, even if nothing else about it looks different.
Every Zenic Labs vial carries a lot number in the format ZEN-YYMM-NNN.
Our prefix. Trade customers who sell under their own brand can use their own prefix, so KL-2609-003 and ZEN-2609-003 are the same physical batch.
The year and month the lot was created. 2609 is September 2026. That's why there's no separate batch date on our labels: the lot already carries it.
A running number within that month, so no two lots ever share a code.
Certificates in this market get reused. One good result can be attached to batch after batch, or to a different product entirely, and the buyer has no way of telling. A lot number is what lets a test be tied to a batch rather than to a brand.
It also tells you which documents actually relate to which vials. A supplier certificate covers the product, with a photo of the vial tested. An independent result, where one exists, is for a specific lot. The lot number on your vial tells you which one you've got.
The question to ask
Not "is this product tested?" but "which lot was tested, and is it the lot I've got?" A seller who can't answer the second question can't really answer the first.
This is where lot numbers earn their place. If a batch ever turns out to be wrong, a supplier with proper records can see exactly which orders received that lot, contact those customers, and withdraw the rest. Without lot numbers the only options are to recall everything or nothing.
The same applies down the chain. A reseller who records which lot went to which customer can do the same for their own customers, quickly. That's why our trade agreement asks resellers to keep those records for at least two years.
Every vial we send is lot-numbered, every lot is recorded against every order it goes out on, and every independent result we have is published against its lot on our testing page.
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
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How white label and wholesale research peptides work in the UK: labels, documentation, traceability, margins and the questions to ask a supplier.
Purity is the headline number on almost every peptide certificate. Here is what it measures, what it doesn't, and the other figures worth reading alongside it.