Buy Retatrutide UK — Lab-Tested Reta Peptide, Shipped Same Day
Retatrutide (LY-3437943) is the first widely available triple agonist targeting GLP-1, GIP and the glucagon receptor. Peptides UK 4U supplies HPLC-verified Retatrutide in 20mg, 30mg and 40mg vials from UK stock — no customs delays, no overseas reshippers.
For in vitro research use only — not for human or animal consumption. Not a licensed medicine in the UK.
Why buy from Peptides UK 4U
- Held in stock in the UK — same working day dispatch (orders before 2pm, Mon–Fri).
- Royal Mail Tracked 24 with photo confirmation on every parcel.
- Discreet plain packaging — no visible branding or product names outside.
- Independent HPLC & mass-spec purity testing — batch-matched Certificate of Analysis on request.
- UK bank card checkout — no crypto required, no overseas transfers.
- Free 4 needles + 4 alcohol swabs available with every vial — opt in at checkout.
Which Retatrutide vial size should I choose?
20mg is the entry vial for shorter research protocols. 30mg is our most-ordered size for ongoing studies. 40mg gives the best £/mg on extended research. All three are the same compound and purity — only the mg per vial differs.
Purity, testing and Certificate of Analysis
Every batch is independently HPLC and mass-spec tested at 99%+ purity. Vials are sealed and lyophilised, batch numbered, and matched to a downloadable Certificate of Analysis — request it on the product page or the COA page.
How Retatrutide compares to Semaglutide and Tirzepatide
Semaglutide is a single GLP-1 agonist. Tirzepatide is a dual GLP-1 + GIP agonist. Retatrutide adds glucagon receptor activity on top — which is why it is the flagship compound of the current metabolic peptide research generation.
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View full shopFrequently asked questions
Is Retatrutide legal to buy in the UK?
Yes — Retatrutide is legal to purchase and possess in the UK for laboratory research purposes. It is not a licensed medicine in the UK and is strictly for in vitro research use only. Not for human or animal consumption.
How long does UK delivery take?
Orders placed before 2pm Monday–Friday ship the same working day via Royal Mail Tracked 24. Most UK addresses receive delivery next working day with tracking and photo confirmation.
Do you ship Retatrutide discreetly?
Every parcel goes out in plain, unbranded packaging with no visible product name or content description on the outside.
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.