Buy Retatrutide UK: Research Peptide Vials, Pens, Prices and Published COAs

For in-vitro laboratory research use only. Not for human or veterinary use. Corex Vitality™ supplies research compounds to adults (18+) for laboratory research. Nothing on this page is medical advice.

Corex Vitality™ supplies Retatrutide as a lyophilised research peptide in vials, and as a solution in research pens, for in-vitro laboratory work in the UK. This page explains what Retatrutide is, what the published receptor research covers, what to check before you buy, and our current sizes, prices and Certificates of Analysis (COAs).

At a glance

What is Retatrutide?

Retatrutide is a synthetic peptide supplied for in-vitro laboratory research. It was designed as a single molecule that acts at three related receptors: the glucagon receptor (GCGR), the GIP receptor (GIPR) and the GLP-1 receptor (GLP-1R) [1]. These receptors belong to the class B1 family of G protein-coupled receptors, and their structures are studied in detail [3][4].

What has been studied? (preclinical receptor research only)

• Receptor profile in cell assays. The discovery paper reports that, in vitro, Retatrutide shows balanced activity at GCGR and GLP-1R, and more activity at GIPR [1].
• Signalling of multi-receptor peptides. A study in HEK293 cells compared single-, dual- and triple-receptor peptide agonists. It measured cAMP, ERK1/2 phosphorylation and β-arrestin2 recruitment at GIPR and GLP-1R [2].
• Receptor structures. Cryo-electron microscopy (cryo-EM) studies show how GIPR recognises its peptide hormone [3], and how a dual-agonist peptide binds GCGR [4]. This is structural background for peptides that act at more than one of these receptors.

This is laboratory and receptor research. It cannot be applied to people. Corex Vitality™ makes no claim about any effect of Retatrutide in the body.

What to check before you buy Retatrutide in the UK

1. The compound named on the COA. Check that the product page and the COA name the same compound and the same size.
2. An open, size-matched COA. We publish COAs for the 10mg, 20mg, 30mg, 40mg and 60mg sizes. Our verification page lists the 20mg and 40mg COAs for both the vial and the pen.
3. The QR check. Scan the QR code on the Lingda COA to see the laboratory’s own record. Our guide shows how to verify a peptide COA.
4. Claims that match the COA. Our Retatrutide COAs report HPLC purity and quantity, heavy metals, endotoxin and sterility. They do not include a separate molecular-mass identity test.
5. Purity vs content. HPLC purity is not net peptide content. See HPLC purity vs net peptide content.
6. Research-only selling and UK business details. Look for a company number, a registered address, an ICO registration, and no human-use instructions.

What our Retatrutide 20mg COA shows

The report is LDA22160902 from Lingda Laboratory. It was tested on 2 September 2026 and issued on 3 September 2026. The laboratory was commissioned by the manufacturer or supplier. Our verification page lists it for the 20mg vial and the 20mg pen.

All published Retatrutide COAs

Open the Retatrutide COAs on our verification page

Corex Vitality™ Retatrutide: sizes and prices

Lyophilised vials

View Retatrutide research peptide

• Multi-Vial Savings: 10% off 2 vials and 15% off 3 or more. You can mix and match. The saving is applied automatically in the basket.

Research pens

View Retatrutide research pen

• Multi-Pen Savings: £10 off 2 pens and £25 off 3 or more. The saving is applied automatically in the basket. Pens are not part of Multi-Vial Savings.
• Pen storage: pens are filled to order as a solution. Keep them refrigerated at 2–8 °C, sealed and away from light. Do not freeze. See Browse peptide pens UK and pens vs lyophilised vials.
• Delivery: free next-day tracked delivery on in-stock orders over £50. See Shipping Information.

Related research compounds

Storage: keep sealed lyophilised vials cool, dry and away from light. See our lyophilised peptide storage guide.

FAQ

Research the range

• Research peptides UK: range, prices and COAs
• GLP-1, GIP and glucagon receptor peptides explained
• How to verify a peptide COA
• Peptide counter-ions: TFA vs acetate
• Search all published COAs

References

Checked against PubMed using NCBI E-utilities on 2 Nov 2026. These are listed for scientific background only.

1. Coskun T, Urva S, Roell WC, Qu H, Loghin C, Moyers JS, et al. LY3437943, a novel triple glucagon, GIP, and GLP-1 receptor agonist […]: From discovery to clinical proof of concept. Cell Metab. 2022;34(9):1234-1247.e9. doi:10.1016/j.cmet.2022.07.013. PMID 35985340
2. Yuliantie E, Darbalaei S, Dai A, Zhao P, Yang D, Sexton PM, et al. Pharmacological characterization of mono-, dual- and tri-peptidic agonists at GIP and GLP-1 receptors. Biochem Pharmacol. 2020;177:114001. doi:10.1016/j.bcp.2020.114001. PMID 32360365
3. Zhao F, Zhang C, Zhou Q, Hang K, Zou X, Chen Y, et al. Structural insights into hormone recognition by the human [GIP] receptor. Elife. 2021;10:e68719. doi:10.7554/eLife.68719. PMID 34254582
4. Chang R, Zhang X, Qiao A, Dai A, Belousoff MJ, Tan Q, et al. Cryo-electron microscopy structure of the glucagon receptor with a dual-agonist peptide. J Biol Chem. 2020;295(28):9313-9325. doi:10.1074/jbc.RA120.013793. PMID 32371397