Buy Retatrutide 40mg UK — The Largest Reta Vial We Stock
The Retatrutide 40mg vial is the largest research size Peptides UK 4U supplies — the best £/mg option for extended in-vitro protocols. HPLC-verified at 99%+ purity, sealed and lyophilised, shipped same working day from UK stock.
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.
Why order the 40mg vial specifically?
40mg gives the lowest cost per mg of any Retatrutide vial we sell. For ongoing research it means fewer reorders, less shipping, and one batch/COA covering the full study window. Reconstitute with up to 3 mL bacteriostatic water; store at 2–8°C once mixed and use within 28 days.
Purity, testing and Certificate of Analysis
Every 40mg batch is independently HPLC and mass-spec tested at 99%+ purity, batch numbered and traceable. Download the matching Certificate of Analysis from the product page or request it by email before you order.
40mg vs 30mg vs 20mg — which vial fits your research?
20mg suits short protocols and first-time evaluations. 30mg is our most-ordered ongoing size. 40mg is the best-value large vial for extended research windows or multi-subject studies — same peptide, same purity, more mg per pound.
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View full shopFrequently asked questions
How much bacteriostatic water do I add to a Retatrutide 40mg vial?
Add up to 3 mL of bacteriostatic water down the side of the vial and swirl gently — do not shake. Use our free reconstitution calculator for exact per-dose volumes based on your protocol.
Is Retatrutide 40mg 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 fast is delivery on the 40mg vial?
Orders placed before 2pm Monday–Friday ship the same working day via Royal Mail Tracked 24, with photo confirmation on delivery. Most UK addresses receive next-working-day delivery.
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.