Verified
Great documentation
Support answered a batch question within a few hours over email. Rare to get that level of response from a research supplier. Product itself is exactly to spec.
Marcus T.Berlin, DE · 21 Apr 2026
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In stockReta Pen
40 mg · ≥99% purity
4.9
Pre-filled research auto-injector pen — 40mg.
£249.00GBP
£249.00 per pen · Tax calculated at checkout · Free UK & EU shipping
Bundle & saveVolume discount applied automatically
1
We accept
≥99% purity
3rd-party HPLC
CoA per batch
Fast UK shipping
Quality guarantee
Every batch is independently HPLC assayed. Certificate of Analysis available on request.
Reta Pen is a pre-filled research auto-injector pen supplied for in vitro laboratory use, supplied by MyPeptides for laboratory research use only.
Reta Pen is a 40 mg pre-filled, pre-assembled research auto-injector. Each pen ships in an ISO-certified assembly with a metered dose window and a batch-specific certificate of analysis, so labs can log a clean chain of custody rather than reconstitute from a vial.
The format matters: pre-filled pens remove one of the biggest sources of variability in peptide research — reconstitution technique. Every replicate draws from the same sealed cartridge at the same concentration.
For lab protocols that need a comparable non-pen format, the catalogue also stocks Retatrutide 5 mg and 10 mg lyophilised vials.
Reta Pen — frequently asked questions
Straight answers on purity, handling, dispatch and research use.
What is Reta Pen?
Reta Pen is a pre-filled research auto-injector pen supplied for in vitro laboratory use, supplied by MyPeptides as a pre-filled research pen for laboratory research use only.
What is Reta Pen used for in research?
In cited literature, Reta Pen is studied in metabolic and receptor-signalling research programmes. It is not a medicine and is not intended for human or veterinary use.
What purity is MyPeptides Reta Pen?
Every batch is third-party HPLC assayed at ≥99% purity. A signed certificate of analysis is available on request after checkout.
How should Reta Pen be stored?
Store refrigerated at 2–8 °C, protected from light. Do not freeze once assembled. Follow your lab's SOP for handling research auto-injectors.
Do you ship Reta Pen to the UK and EU?
Yes — tracked Royal Mail and DPD dispatch across the UK and EU, with free shipping on orders over £200. Weekday orders placed before 12:00 UK time ship the same day.
Reta Pen reviews
Verified feedback from qualified researchers across the UK & EU.
5.0(6 reviews)
Swipe
Verified
Great documentation
Support answered a batch question within a few hours over email. Rare to get that level of response from a research supplier. Product itself is exactly to spec.
Marcus T.Berlin, DE · 21 Apr 2026
Verified
Trust these guys
Documentation is what sold me. Independent CoA per batch, clean HPLC traces. Reconstitution behaved exactly as expected. Solid supplier for research use.
Amelia S.Edinburgh, UK · 3 May 2026
Verified
Exactly as described
Ordered late Monday, arrived Wednesday morning in the UK. Packaging was cold-protected and every vial sealed correctly. CoA matched the batch number on the label.
Anton V.Vienna, AT · 26 Mar 2026
Verified
Solid product, will reorder
Everything about this feels professional - from the site to the packaging to the paperwork. Purity assay matches what is on the label. Will keep ordering.
Daniel B.Milan, IT · 21 Apr 2026
Verified
Quality packaging, quick dispatch
Ordered a bundle to save on shipping - all vials arrived in one insulated pack, labels identical batch, CoA covers the lot. Great value.
Ethan W.Dublin, IE · 21 Jun 2026
Verified
Fast UK shipping
Clean product, no discoloration, correct fill. Certificate of analysis was in the box AND emailed. Very straightforward experience.
Jonas F.Copenhagen, DK · 17 Jun 2026
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