"Reta pen UK" is a common search, but it's worth being clear up front: Sculpt Labs does not sell Retatrutide pens. We supply Retatrutide only as a lyophilised research peptide in sealed vials, for laboratory research use. This page explains the difference.
What is Retatrutide?
Retatrutide (LY3437943) is a synthetic peptide studied as a triple agonist of the GLP-1, GIP and glucagon receptors. It is an investigational compound and is not an approved medicine in the UK.
What does "reta pen" mean?
"Reta pen" is informal shorthand for Retatrutide presented in a pen-style cartridge. It describes a presentation format, not a different compound. The peptide itself is the same whether it sits in a cartridge or a vial.
Why research suppliers use lyophilised vials
Freeze-drying (lyophilisation) removes water from the peptide, which keeps it stable during storage and transit. Sealed vials also make batch identification and independent purity testing straightforward — every vial maps to a tested batch. Laboratories reconstitute the powder with bacteriostatic water for in-vitro work; our reconstitution guide covers the lab method.
Verified purity
Our Retatrutide is independently HPLC-tested by Janoshik, with each Certificate of Analysis published on our Purity Reports page.
Frequently asked questions
Does Sculpt Labs sell a Retatrutide pen?
No. Sculpt Labs supplies Retatrutide only as a lyophilised (freeze-dried) powder in sealed research vials, such as the Retatrutide 20 mg vial.
What do people mean by a 'reta pen'?
'Reta pen' is an informal search term for Retatrutide presented in a pen-style cartridge format. It describes a presentation format only — the compound is the same peptide.
Why are research vials supplied as lyophilised powder?
Lyophilisation removes water so the peptide stays stable during storage and transit. Laboratories reconstitute it with bacteriostatic water for in-vitro work.
How is purity verified?
Each batch is independently HPLC-tested by Janoshik, and the Certificates of Analysis are published on our Purity Reports page.
Retatrutide 20 mg research vial — HPLC verified, UK Tracked 24.
View Retatrutide 20 mg →⚠ For research purposes only — not for human consumption.