NEW COAs JUST LANDED — 99% purity across every GLP-1 compound•Independently lab-tested by Analiza Bialek European testing•Third-party verified identity & purity — every compound, every time•The real deal. Traceable compound numbers. Downloadable certificates.•View the latest Certificates of Analysis →•NEW COAs JUST LANDED — 99% purity across every GLP-1 compound•Independently lab-tested by Analiza Bialek European testing•Third-party verified identity & purity — every compound, every time•The real deal. Traceable compound numbers. Downloadable certificates.•View the latest Certificates of Analysis →•
Peptides UK 4U0
Semaglutide UK

Semaglutide UK — GLP-1 Research Peptide

Semaglutide is the original modern GLP-1 receptor agonist — the reference compound that opened the door to today's metabolic research peptide market. Peptides UK 4U supplies Semaglutide as 30mg vials and pre-filled Quick Pens, dispatched same-day from the UK with independent HPLC certificates on every batch.

Why researchers still choose Semaglutide

Newer dual and triple agonists exist, but Semaglutide remains the most-studied compound in the space and the reference standard against which every newer GLP-1 analogue is compared. For any study that needs a well-characterised baseline GLP-1 agonist, it is still the compound of choice.

Vial sizes, pens & purity

  • Semaglutide 30mg vial — flexible dosing for extended research programs.
  • Semaglutide Quick Pen — pre-filled, ready-to-dose, same lab-tested batch.
  • Every batch independently HPLC tested at ≥99% purity, with COA published on our COA page.

Reconstitution — quick reference

Draw bacteriostatic water and add it slowly down the inside wall of the vial. Never shake. Swirl gently until fully dissolved and refrigerate. For exact volumes, use our peptide reconstitution calculator.

UK dispatch & discreet delivery

Every Semaglutide order ships from our UK facility with Royal Mail 24-hour tracked delivery. Vials are packed with ice packs and insulation, in plain unbranded packaging. Card payments are processed by Square with 3-D Secure.

Browse related products

View full shop

Frequently asked questions

What is Semaglutide?

Semaglutide is a synthetic GLP-1 receptor agonist peptide, the original single-agonist compound behind the modern metabolic research peptide space. It remains the most-studied GLP-1 analogue available.

Where can I buy Semaglutide in the UK?

Peptides UK 4U stocks Semaglutide 30mg vials and pre-filled Quick Pens, dispatched next-day from the UK with full tracking. Every vial is independently HPLC tested.

Is Semaglutide legal in the UK?

Semaglutide is legal to purchase and possess for laboratory research purposes in the UK. It is not a licensed medicine and is strictly for in-vitro research use only.

Semaglutide vs Tirzepatide vs Retatrutide?

Semaglutide targets GLP-1 alone, Tirzepatide targets GLP-1 and GIP, and Retatrutide targets GLP-1, GIP and glucagon. See our comparison pages for the full breakdown.

How do I reconstitute Semaglutide?

Add bacteriostatic water slowly down the side of the vial. Never shake. Once dissolved, store at 2–8°C and use within 28 days. Our peptide calculator gives exact reconstitution volumes.

Semaglutide vial or Quick Pen — which is better?

Vials give you the widest dosing flexibility for research; Quick Pens arrive pre-filled and ready to dose. Both come from the same lab-tested batches.

Disclaimer: All products sold by Peptides UK 4U are for laboratory and research purposes only. They are not intended for human or animal consumption, diagnosis, treatment or prevention of any disease.

View basket0Checkout