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Three action-first guides covering every step between placing a query and holding a verified Certificate of Analysis: how to request it, how to read batch and lot numbers, and what to ask before you ever place an order.
All guides
A COA build is the full set of test parameters a lab reports together — identity, purity, and quantity — not any single number read in isolation. How the sections fit together, and the one check that confirms a certificate actually matches the material it claims to describe.
Injectable Wegovy is HPRA-authorised as a prescription-only medicine under the Medicinal Products Regulations. Unlicensed powders, drops and nasal sprays sold online carry no HPRA authorisation and fall outside the legal supply chain.
The exact words to use, how to phrase the request, what to do when a supplier stalls, and the scripts that get a batch-specific certificate instead of a generic PDF.
What batch and lot numbers actually mean, how manufacturers assign them, and the one cross-check that confirms a COA truly belongs to the material in your hand.
The full list of questions to send a supplier before committing: test method, issuing lab, accreditation, purity threshold, and how to read their answers for red flags.
Injectable Wegovy is MHRA-authorised as a prescription-only medicine. Oral Wegovy received marketing authorisation in June 2026 — the first in Europe. Unlicensed powders, drops and patches fall outside the Human Medicines Regulations 2012.
Retatrutide (LY3437943) holds no marketing authorisation in any country as of mid-2026. The MHRA has confirmed it cannot be legally prescribed in the UK. TRIUMPH Phase 3 data gates the submission timeline — earliest 2026–2027, NHS 2028 at the soonest.