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Five guides on reading peptide quality documentation: what a COA build contains, how batch and lot numbers tie a certificate to a vial, what a supplier should provide, the layers of a batch record, and where semaglutide stands under UK and Irish rules.
All guides
A COA build is the set of lab documents around one batch. Five consistency checks and a worked mass calculation show whether the file holds together, plus the UK and Ireland regulatory status.
What a supplier should provide with a COA: the lot, the issuing laboratory, the chromatogram and the spectrum, and how to read the reply against the label.
What batch and lot numbers mean, how they are assigned, and the one cross-check that confirms a COA belongs to the material in your hand.
The six layers of a peptide batch record (provenance, purity, identity, content, safety markers) and what each can and cannot show.
Authorised Wegovy is prescription-only in the UK, and a tablet was approved on 11 June 2026. Unlicensed powders, drops and patches fall outside the law, and a COA does not change that. Includes the Irish position.