What is the Reta Pen?
The Reta Pen is a pre-filled auto-injector supplying retatrutide 40 mg as a reference-grade reagent for laboratory research. Retatrutide (CAS 2381089-83-2, molecular weight 4731.34 g/mol) is a single-molecule triple receptor agonist studied at the GLP-1, GIP and glucagon receptors. Every Reta Pen ships with a batch-specific certificate of analysis and is intended strictly for in-vitro research use only — not for human or veterinary use.
Researchers choose the Reta Pen format because a pre-filled pen removes reconstitution variability and keeps the retatrutide in a controlled, sealed presentation from dispatch to bench. Each batch is HPLC-verified to ≥99% purity and tested by an ISO/IEC 17025-accredited third-party laboratory, with the COA supplied in the box so identity and purity can be confirmed on arrival.
Reta Pen UK — sourcing and 24-hour delivery
For UK research teams, sourcing a retatrutide pen in the UK from a domestic supplier avoids the customs delays and broken cold chain that come with overseas retatrutide sources. We ship from within the UK, so it never clears customs. Orders placed before the daily cut-off are dispatched the same working day on a tracked, signed-for service for next-working-day UK delivery, packed cold-chain where required.
- Compound Retatrutide (reference)
- Format Pre-filled auto-injector pen
- Strength 40 mg total content
- Purity HPLC ≥99% · batch COA
- CAS number 2381089-83-2
- Molecular weight 4731.34 g/mol
- Storage2–8 °C · protect from light
- Dispatch Same-day · 24h UK delivery
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