What is Batch (Lot) Number? (Peptide Glossary)
Batch (Lot) Number: The identifier tying a specific vial to its manufacturing run - the link that makes a COA meaningful.
A batch or lot number identifies the specific manufacturing run a vial came from. It is the connective tissue of quality control: a COA is only meaningful if its batch number matches the batch number on the product you received. A vendor can show a beautiful third-party COA, but if your vial has no lot number or a different one, that document tells you nothing about your product.
Batch discipline separates professional operations from resellers. Professional vendors label every vial with a lot number, test every batch, and publish COAs indexed by batch. Weaker vendors buy bulk powder, fill vials without batch tracking, and reuse a single COA indefinitely - the document becomes marketing rather than quality control.
When a supplier's COA page shows a long history of dated, batch-specific third-party results, that archive is itself a trust signal: it demonstrates ongoing testing expenditure and a supply chain with real traceability. Our COA status scoring weights batch-specific testing history heavily for exactly this reason.
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