Where to buy Semaglutide in the UK: the licensed route is a prescription, and no research seller has a verifiable COA
Semaglutide is Novo Nordisk's Ozempic and Wegovy, a prescription-only medicine in the UK, so the licensed route is a prescription from a pharmacy; research-vial sellers offer unlicensed copies. Of the 536 UK research-peptide sellers we audit, none publishes a verifiable own-name Janoshik certificate naming Semaglutide, so there is no research-vial source whose testing you can check. It is a licensed prescription medicine, not a research peptide, so it sits in a tighter legal category The Peptide Watch does not list vendors for and does not endorse buying outside a prescription.
Who holds the newest Semaglutide report
None yet. No seller on the verified list has published a report on Janoshik's own website that names the seller as the client and covers Semaglutide. Any of the 40 verified sellers is where testing can be checked; see the full list.
A record of paperwork, not a recommendation: The Peptide Watch sells nothing, takes no money from sellers and links to none of them.
Why the date matters · What purity means · What Semaglutide is · Regulators
Why the date on a certificate matters
What a purity figure means
The purity on a Janoshik report is the share of the main peak in an HPLC chromatogram. 99.5% means that 99.5% of what the detector saw was one substance and 0.5% was something else. It is not the amount in the vial: that is the separate quantity line, in milligrams. It does not by itself prove which substance the peak is: that is identity, confirmed by mass spectrometry. And it says nothing about sterility, endotoxins or heavy metals, which are separate tests.
A purity figure printed on a shop page with no report behind it is a claim, not a measurement. Between two reports, the difference that matters is rarely 99.2% against 99.8%; it is whether the report exists at all, names the seller as the client, covers this compound on its own, and is recent.
What Semaglutide is, and what it is sold as
Semaglutide is a GLP-1 compound (the active ingredient in Ozempic and Wegovy). Semaglutide is Novo Nordisk's Ozempic and Wegovy, a prescription-only medicine in the UK, so the licensed route is a prescription from a pharmacy; research-vial sellers offer unlicensed copies.
| Development status | Licensed medicine. MHRA authorisations for type 2 diabetes and weight management, with an oral Wegovy tablet and a MASH indication added in 2026; also licensed in the EU and US. |
|---|---|
| Originator | Novo Nordisk A/S. Rights: Novo Nordisk A/S, sold as Ozempic, Wegovy and Rybelsus. |
| Registered clinical trials | 752 on ClinicalTrials.gov |
The largest evidence base of any compound on this site. PubMed indexes 5,463 papers, 337 clinical-trial reports and 91 phase 3 reports; ClinicalTrials.gov lists 752 registered trials. It is Novo Nordisk's Ozempic, Wegovy and Rybelsus.
Licensed in the UK, as a prescription medicine. Semaglutide holds MHRA marketing authorisations for type 2 diabetes and for weight management, extended in 2026 to an oral Wegovy tablet and to metabolic dysfunction-associated steatohepatitis (MASH). The lawful supply is a pharmacy dispensing Novo Nordisk's product against a prescription.
A research-chemical vial is a different product. Whatever a verifiable certificate says about the powder in a vial, it is not the licensed medicine, and selling it as one is unlawful. The certificate answers one question only: whether an independent laboratory found the tested sample to be what the label says.
The published record in numbers, and the sources
| Papers on PubMed | 5463 |
|---|---|
| Indexed as rat or mouse studies | 375 |
| Indexed as clinical trials | 337 |
| Published since 2020 | 5166 |
Counts are from PubMed on 15 September 2026 using the queries recorded in our evidence file. A description of the published record, not medical advice and not an argument for or against use.
- Cost-effectiveness of tirzepatide versus semaglutide for patients with obesity or overweight in the US: evidence from the SURMOUNT-5 head-to-head phase-3 trial. (J Med Econ, 2026, PMID 42012820)
- Effects of semaglutide and empagliflozin on markers of endothelial function in persons with type 2 diabetes: A post hoc analysis of a randomized clinical trial. (J Diabetes Complications, 2026, PMID 42679726)
- Once-weekly IcoSema versus once-daily insulin glargine U100 in type 2 diabetes management (COMBINE 4): an open-label, multicentre, treat-to-target, randomised, phase 3b trial. (Lancet Diabetes Endocrinol, 2026, PMID 42594928)
- Efficacy and safety of once-weekly semaglutide 2·4 mg in Chinese adults with overweight or obesity (STEP 12): a randomised, double-blind, placebo-controlled, multicentre, phase 3b trial. (Lancet Diabetes Endocrinol, 2026, PMID 42575111)
- Efficacy and Safety of Semaglutide for Weight Loss in Obesity Without Diabetes: A Systematic Review and Meta-Analysis. (J ASEAN Fed Endocr Soc, 2022, PMID 36578889)
- Semaglutide for management of obesity in adolescents: efficacy, safety, and considerations for clinical practice. (Curr Opin Pediatr, 2024, PMID 38774967)
- Assessment of Thyroid Carcinogenic Risk and Safety Profile of GLP1-RA Semaglutide (Ozempic) Therapy for Diabetes Mellitus and Obesity: A Systematic Literature Review. (Int J Mol Sci, 2024, PMID 38673931)
- Medscape, MHRA approves oral semaglutide for weight loss (2026)
- European Medicines Agency, Wegovy
What regulators say about Semaglutide
In the UK. Prescription-only medicine in the UK.
We hold no statement from the FDA, MHRA or EMA specifically about Semaglutide on file. Its development and licence sources are listed under the record above.
Questions people ask
Which UK sellers publish a verifiable Janoshik certificate naming Semaglutide?
As of 20 October 2026, none that we have read. No seller on our verified list has published a report on Janoshik's own website that names the seller as the client and lists Semaglutide.
How do I check that a certificate for Semaglutide is genuine?
Four things: an independent laboratory is named; the client field names the seller you are buying from, not a supplier; the compound line says Semaglutide; and the report's task number and key open the same report on the laboratory's own website (verify.janoshik.com). A branded PDF with no laboratory name and no verification code fails on the first check, however professional it looks. The free COA Checker on this site runs the checks for you.
Is Semaglutide licensed in the UK?
Semaglutide is Novo Nordisk's Ozempic and Wegovy, a prescription-only medicine in the UK, so the licensed route is a prescription from a pharmacy; research-vial sellers offer unlicensed copies. The Peptide Watch does not rank or recommend anywhere to buy it, and does not give legal or medical advice.
Why does The Peptide Watch not say where to buy Semaglutide?
Because the site records paperwork, not recommendations. A verifiable certificate proves that a sample of one batch was tested. It does not prove the vial you receive matches it, and it says nothing about whether you should buy a prescription medicine outside a pharmacy at all. Listing which sellers publish a certificate you can check, and which publish nothing, is as far as the evidence goes.
Semaglutide in the UK at a glance
| Active UK sellers listing Semaglutide | 24 |
|---|---|
| Of which publish a verifiable own-name certificate | 0 |
| Of which name no laboratory at all | 7 |
Counted from the vendor ledger at build time. The A-Z directory lists every seller and what each publishes instead.
The Peptide Watch's position on Semaglutide
Semaglutide is a regulated medicine. The Peptide Watch audits research-peptide sellers and does not rank or recommend anywhere to buy Semaglutide; this page exists so the verification standard is clear. If you can verify a seller's testing, you can at least judge its evidence; if you cannot, you are trusting marketing on a regulated medicine sold outside its licensed supply chain. See how UK research-peptide testing stacks up in the market statistics.
Research-use-only information, not medical, dosing or purchasing advice. The Peptide Watch sells nothing and links to no seller. A certificate proves a sample was tested once, not that a specific vial matches it.