Description
Retatrutide UK: research-grade retatrutide peptide
Retatrutide (LY3437943) is an investigational triple-receptor agonist that combines activity at the GIP, GLP-1 and glucagon receptors in a single 39-residue peptide. We supply research-grade retatrutide peptide in the UK from UK-held stock, as a lyophilised powder in 10mg, 20mg and 40mg vials, with every batch purity tested by Janoshik using HPLC.
“Reta” is the common short name for retatrutide; both refer to the same compound. Retatrutide is not a licensed medicine in the UK. We supply it strictly as a research reagent for in vitro laboratory work.
Specifications
| Name | Retatrutide (Reta, LY3437943) |
|---|---|
| Target receptors | GIP, GLP-1 and glucagon (triple agonist) |
| Structure | 39-amino-acid peptide with non-standard residues and a C20 fatty diacid side chain |
| Molecular formula | C221H342N46O68 |
| Molecular weight | ≈ 4731 g/mol |
| CAS number | 2381089-83-2 |
| Form | White lyophilised powder in a sealed glass vial |
| Sizes | 10mg · 20mg · 40mg |
Choose your vial size
Select the size above the add-to-cart button. All sizes are the same compound and are supplied in the same sealed vial format.
Why buy retatrutide from Sterling in the UK
We supply retatrutide only as lyophilised powder in sealed research vials. We do not sell pens, pre-filled devices or any product for human use.
Retatrutide UK status
Retatrutide is still in Phase 3 clinical trials and has no MHRA authorisation, so it is not available in the UK as a medicine. For the latest on UK availability, legal status and how to spot fake retatrutide, read our Retatrutide UK guide.
Quality and testing
Every batch is purity tested by Janoshik, an independent laboratory, using HPLC before it is released for sale. Read more about our process on the Quality & Testing page.
Storage and handling
Store the lyophilised powder at −20 °C, sealed and protected from light and moisture. Allow the vial to reach room temperature before opening to limit condensation. Prepare solutions according to your laboratory’s validated protocols, using appropriate PPE.
Lipidated peptides such as retatrutide can adsorb to plastic surfaces. Follow your protocol for buffer choice and low-binding labware.
Further reading
For the full research background, mechanism and published literature, see our Retatrutide research guide, the Retatrutide UK guide and the Retatrutide vs Tirzepatide comparison. Also see tirzepatide and cagrilintide.
Frequently asked questions
Can I buy retatrutide in the UK?
Research-grade retatrutide peptide can be bought in the UK as a laboratory reagent, and we supply it from UK-held stock in 10mg, 20mg and 40mg vials. Retatrutide is not a licensed medicine in the UK, so it cannot be bought for human use. See our guide to retatrutide UK availability and legal status.
Where can I buy retatrutide peptide in the UK?
Right here. Sterling Peptides, the trading name of Sterling Research Group Ltd (UK company no. 17078385), supplies research-grade retatrutide peptide from UK-held stock, with every batch purity tested by Janoshik using HPLC.
Do you sell retatrutide pens or injections?
No. We supply retatrutide only as lyophilised powder in sealed research vials. We do not sell pens, pre-filled devices or any product intended for human use.
How does Retatrutide differ from Tirzepatide in research?
Tirzepatide is a dual agonist that acts at the GIP and GLP-1 receptors. Retatrutide adds a third target, the glucagon receptor, in a single peptide. This makes it a useful comparison compound when studying how glucagon receptor activity adds to incretin signalling in vitro. See our Retatrutide vs Tirzepatide comparison.
What purity is your Retatrutide?
Every batch is purity tested by Janoshik, an independent laboratory, using HPLC before it is released for sale.
Which vial size should I choose: 10mg, 20mg or 40mg?
All three sizes contain the same compound in the same sealed vial format. Choose the quantity that suits your study. The 40mg vial lets you work from a single batch for longer.
How is Retatrutide reconstituted?
Reconstitution should follow your laboratory’s validated protocol, using a suitable diluent, aseptic technique and appropriate PPE. Allow the vial to reach room temperature first. We do not provide volumes, concentrations or any guidance for human or animal use.
How stable is reconstituted Retatrutide?
Stability in solution depends on the diluent, concentration, container and storage temperature, so it should be validated within your own protocol. Lyophilised powder should be stored sealed at −20 °C, protected from light and moisture.
How fast is UK delivery?
Orders placed before 3PM UK time, Monday to Friday, are normally dispatched the same day from UK stock by Royal Mail Tracked 24, usually arriving in 1–2 working days. See our Shipping Policy.
Do you provide dosing or usage advice?
No. Retatrutide is supplied for in vitro laboratory research only. We do not provide dosage, administration or medical advice of any kind.
Research use only. This product is supplied strictly for in vitro laboratory research. It is not for human or animal use, and not for diagnostic or therapeutic purposes. By purchasing, you agree to our Research Use Disclaimer.
