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myPEPT Retatrutide research pen — Halloween 2026 dark

What the Reta Pen is and its research context

The Reta Pen is retatrutide in a pre-filled pen format with a click mechanism, offered in 10 mg, 20 mg and 30 mg strengths. It contains the same retatrutide as our vials: a synthetic 39-amino-acid peptide with affinity for the GLP-1, GIP and glucagon receptors, built on a GIP-based backbone with α-aminoisobutyric acid at position 2 and a C20 fatty-diacid side chain that extends its pharmacokinetic profile through albumin binding.

Retatrutide is studied in preclinical research on multi-receptor incretin and glucagon signalling and on comparative receptor pharmacology against single and dual agonists. The pen format exists for laboratories that prefer a sealed, pre-filled unit over a lyophilised vial that has to be reconstituted on the bench. Each pen is labelled with its strength and lot number, which keeps inventory records simple when several strengths are held at once.

Specification and quality

  • Format: pre-filled pen with click mechanism, available in 10 mg, 20 mg and 30 mg.
  • Purity: ≥99% retatrutide, verified per batch by HPLC and mass spectrometry.
  • Certificate of analysis: every batch is tested by an independent third-party laboratory and the COA is published on the lab results page. Check the lot number on the pen against the certificate.
  • Storage: keep pens cool and protected from light, and follow your laboratory's procedures for handling once a pen has been opened.

The pen is one of several retatrutide formats at myPEPT. Laboratories that reconstitute their own material can choose 5 mg, 10 mg and 20 mg vials, research kits that include 3 ml of bacteriostatic water, Reta Duo two-vial packs or the Reta Triplet.

Ordering from myPEPT in Ireland and Europe

The Reta Pen ships within Europe, including Ireland, and every parcel is tracked. Customers in Ireland can pay by card, PayPal, Klarna or SEPA transfer; other European countries see their local payment options at checkout. Our support team answers questions about batches, certificates and order status before and after purchase.

The Reta Pen is sold strictly for laboratory research use only and is not for human consumption. myPEPT makes no medical claims and does not give legal advice; buyers confirm at checkout that they are purchasing for research purposes and are responsible for compliance with the rules that apply to them.

Related products

HPLC + Mass-Spec Verified
Third-party tested each batch.
24-hour EU Dispatch
Cold-packed from Antwerp warehouse. Typical 2–5 day delivery.
Discreet, Secure Checkout
iDEAL, SEPA, card & crypto. No product references on invoice.
COA on Every Order
Certificate of Analysis matched to your exact lot, by email.

Frequently asked

11 questions
How fast is delivery and which carriers do you use?
Orders placed before 16:00 CET ship the same business day from the Netherlands via DPD or PostNL. EU-wide delivery typically takes 2–5 working days, fully tracked. Every parcel ships in plain, unbranded packaging with no peptide-related markings visible.
Which payment methods do you accept?
We accept iDEAL (Netherlands), Bancontact (Belgium), Klarna pay-later, SEPA instant bank transfer, and Visa/Mastercard credit and debit cards. All payments are processed through PCI-DSS-compliant European processors. Bank transfer and card orders ship within 24 hours of payment confirmation.
How do you verify peptide purity?
Every batch is HPLC-tested to 99% purity or higher by an independent third-party laboratory, with identity confirmed by mass spectrometry. The batch-specific Certificate of Analysis is published on every product page and delivered with the order.
Are research peptides legal to buy in the Netherlands and EU?
Yes — when sold and purchased strictly for in-vitro laboratory research. Research peptides on my\PEPT.eu are not approved, marketed or intended for human or veterinary use, medical diagnosis or therapeutic application. By placing an order you confirm research-only intent and accept responsibility for compliance with local regulations.
How should research peptides be stored?
Lyophilized (freeze-dried) peptides keep up to 24 months at −20 °C in a sealed vial. Once reconstituted in bacteriostatic water, store at 2–8 °C and use within 28 days. Avoid repeated freeze-thaw cycles and direct sunlight.
What is the Reta Pen?
The Reta Pen is retatrutide supplied in a pre-filled pen with a click mechanism instead of a lyophilised vial. It contains the same ≥99% purity research peptide as our vials and is labelled with its strength and lot number. It is sold strictly for laboratory research use only.
Which strengths of the retatrutide pen are available?
The Reta Pen is offered in three strengths: 10 mg, 20 mg and 30 mg of retatrutide per pen. Each strength is listed separately so that laboratories can order the quantity that matches their research plan, and every pen carries a lot number that links to its certificate of analysis.
Is the Reta Pen the same retatrutide as the vials?
Yes. The retatrutide in the pen is the same synthetic 39-amino-acid peptide sold in our 5 mg, 10 mg and 20 mg vials, tested to the same ≥99% purity standard by an independent laboratory. The difference is the format: a pre-filled pen rather than lyophilised powder.
How is the Reta Pen tested?
Every batch is analysed by an independent third-party laboratory using HPLC and mass spectrometry. The resulting certificate of analysis is published on our lab results page, and the lot number on the certificate matches the lot number printed on the pen you receive.
Can I order the retatrutide pen in Ireland and pay with Klarna?
Yes. The Reta Pen ships within Europe, including Ireland, with tracking on every parcel. Customers in Ireland can pay by card, PayPal, Klarna or SEPA transfer. Other European countries see their local payment options at checkout.
What does research use only mean for the Reta Pen?
The Reta Pen is sold exclusively for laboratory research and is not for human consumption. myPEPT does not provide instructions for use in people and makes no medical claims. Buyers confirm their research purpose at checkout and are responsible for compliance with the rules that apply to them.
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For research use only. This product is intended exclusively for in-vitro research and laboratory applications. Not approved for human or animal consumption, medical treatment, or therapeutic use.