3rd-party lab tested Reta Pen — Retatrutide 40mg
Pre-filled 40 mg reference-grade pen. For in-vitro use only.
How many Reta Pens do you need?
Plan your research supply — each Reta Pen delivers 40 mg of retatrutide reference material.
For research-supply planning only. Reta Pen is a research-use-only reference material — not for human or veterinary use, and this calculator does not provide dosing guidance.
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. If you are new to handling pre-filled reference pens, our handling and storage guide covers cold-chain and shelf-life.
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. When you buy the retatrutide pen (UK) from PeptidesVerified, the Reta Pen ships 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. See our guide to 24-hour UK delivery for dispatch cut-offs and exactly what to verify when your pen arrives. To compare retatrutide with related compounds in a research context, read retatrutide vs tirzepatide.
- CompoundRetatrutide (reference)
- FormatPre-filled auto-injector pen
- Strength40 mg total content
- PurityHPLC ≥99% · batch COA
- CAS number2381089-83-2
- Molecular weight4731.34 g/mol
- Storage2–8 °C · protect from light
- DispatchSame-day · 24h UK delivery
Reta Pen — frequently asked
Is the Reta Pen the same as retatrutide?
Yes. The Reta Pen is a pre-filled auto-injector containing retatrutide (40 mg total content), supplied as a reference-grade reagent for laboratory research use only.
How fast is Reta Pen delivery in the UK?
Orders placed before the daily dispatch cut-off are sent the same working day on a tracked, signed-for service, arriving next working day across mainland UK.
Does the Reta Pen come with a certificate of analysis?
Every Reta Pen ships with the batch-specific COA for its lot, showing HPLC purity and identity so you can verify the compound on arrival.
What purity is the Reta Pen?
Each batch is HPLC-verified to ≥99% purity and tested by an ISO/IEC 17025-accredited third-party laboratory.
Can the Reta Pen be used on humans or animals?
No. The Reta Pen and all products are supplied strictly for in-vitro laboratory research use only — not for human or veterinary use, consumption, or any diagnostic or therapeutic purpose.
Where can I buy a retatrutide pen in the UK?
You can buy a retatrutide pen (UK) directly from PeptidesVerified. The Reta Pen is our retatrutide 40 mg reference pen, dispatched same-day for 24-hour UK delivery with a batch-specific COA in every box.
How much does a retatrutide pen cost?
Reta Pen pricing is tiered by quantity — the per-pen price drops on volume and trade orders. Current pricing is shown on this page in your local currency; for bulk or trade rates, enquire on WhatsApp.
Is a retatrutide pen legal to buy in the UK?
The retatrutide pen is supplied strictly as a reference-grade reagent for laboratory research use only. It is not a licensed medicine and is not sold for human use. Buyers are responsible for confirming compliance with the regulations that apply to them.
Reta Pen vs a retatrutide vial — what's the difference?
The Reta Pen is a pre-filled auto-injector format of retatrutide, whereas a vial is a separate presentation that requires reconstitution. The pen removes reconstitution variability and keeps the retatrutide sealed and controlled until use.
More reference-grade research pens.
Batch-tested by ISO-accredited third-party labs. Cold-chain dispatch from the UK. Enquire for current pricing and availability.
You may also need.
TIRZ PEN 40mg
SEMA PEN 40mg
Reference-grade compound, packed for the lab.
- 1× RETA PEN 40mg (40 mg pre-filled)
- Handling accessories (needles & alcohol swabs)
- Storage & handling insert
- Batch-matched Certificate of Analysis
- Free UK 24h tracked shipping, validated 96 hours
- Strictly for in-vitro use — not for human or veterinary use
Reference-grade data for your protocol.
| Compound | Reta (reference peptide) |
| CAS number | 2381089-83-2 |
| Molecular formula | C221H343N51O58 |
| Molecular weight | 4731.34 g/mol |
| Purity method | HPLC · ≥99% (batch COA) |
| Presentation | Pre-filled auto-injector · 40 mg total content |
| Physical form | Sterile liquid · clear, colorless |
| Storage | 2–8 °C · protect from light · do not freeze |
| Shelf life | 24 months from batch date · in-use 28 days at 2–8 °C |
| Batch / Lot | Batch-specific · listed on the shipped COA |
Reported areas of investigation.
These reference-grade compounds are supplied strictly for in-vitro laboratory research. Reported research areas include receptor pharmacology, cell-line assays and comparative in-vitro studies.
| Category | Reported use in literature |
|---|---|
| Receptor pharmacology | In-vitro binding & activation assays on cultured receptor lines |
| Cell-line assays | Comparative in-vitro characterisation |
| Analytical reference | Chromatographic and mass-spec identity standards |
| Stability studies | Formulation and cold-chain stability research |
Reference materials only
PeptidesVerified does not publish dosing schedules, titration protocols, reconstitution instructions or any application guidance. All product information is limited to analytical identity, purity and handling.
Reference information for laboratory research only. Not a recommendation for human or veterinary use. No application, dosing or administration guidance is provided.
Third-party independently lab tested.
Every batch is analysed by an ISO/IEC 17025 accredited independent laboratory before dispatch. The signed COA travels with your order — tap a certificate to view it.
For laboratory research use only
PeptidesVerified supplies reference-grade research compounds exclusively to qualified researchers and laboratories for in-vitro and laboratory research. These products are not for human or veterinary use, are not medicines, supplements or therapeutic products, and have not been evaluated by the FDA or MHRA. No medical, therapeutic or human-use claims are made. Buyers confirm they are 21+ and purchasing for legitimate research purposes.
Compound information.
RETA PEN 40mg
Stability
Why researchers choose us.
Third-party lab tested
Every batch HPLC-verified by an independent ISO 17025 lab; signed COA with each order.
free UK 24h dispatch
Shipped from the UK, cold-chain packed and validated for 96 hours in transit.
Multiple payment methods
Card processors, bank transfer (BACS · SEPA · SWIFT) — never dependent on one provider.
Direct support
Quotes, batch COAs and order tracking handled directly over WhatsApp.
Pay the way that works for your lab.
Business-to-business invoicing across multiple processors and settlement rails so your supply is never interrupted. Payment details are shared privately after your enquiry.
Visa, Mastercard and American Express accepted through multiple processors. You receive a private secure link — no card details entered on this site.
Business-to-business invoicing for UK labs, EU institutions and international customers. Multi-currency settlement — no card fees on your side.
Frequently asked.
Are these products for human or animal use?
Do you provide dosing, administration or protocol instructions?
Is it really independently lab tested?
What payment methods do you accept?
How does quantity pricing work?
How fast is shipping?
How should the pens be stored?
For laboratory research use only
All materials offered by PeptidesVerified Ltd, trading as PeptidesVerified, are supplied strictly and exclusively for in-vitro laboratory research and analytical purposes. They are sold only to laboratories, qualified researchers, and research institutions. They are not medicines, not natural health products, not dietary supplements, and not cosmetics, and they hold no Marketing Authorisation or product licence from the MHRA, the FDA or any other regulator.
Our products are not intended for human consumption, human or veterinary administration, diagnostic use, or therapeutic use of any kind, and must not be used for any such purpose. Any use outside in-vitro laboratory research is strictly prohibited and voids all warranties and remedies. We do not provide, and will not respond to requests for, dosing, clinical or usage guidance for humans or animals.
By ordering, the purchaser confirms they are of legal age (21+), acting for a legitimate laboratory or research purpose, and will handle, store, and dispose of all materials in accordance with applicable UK and local regulations. Full conditions are set out in our Terms & Conditions and Research Use FAQ.
