Retatrutide 40mg
Retatrutide (LY3437943) is a triple agonist acting at the GIP, GLP-1 and glucagon receptors. The addition of glucagon receptor activity is what separates it from dual-incretin compounds and is the main focus of current study.
- Triple GIP / GLP-1 / glucagon receptor agonist
- Investigated for combined incretin action and energy expenditure
- Among the most-referenced next-generation metabolic research peptides
- Presentation
- 40 mg Pen
- Purity
- 99.59%
Sold strictly for in-vitro laboratory research. Not for human or veterinary consumption.
Research background
Retatrutide extends the incretin approach by adding glucagon receptor agonism to GIP and GLP-1 activity. Glucagon signalling is associated with increased hepatic energy turnover, so the tri-agonist design is studied as a way to combine appetite and insulin effects with a change in energy expenditure rather than intake alone.
Because three receptor systems are engaged at once, much of the literature concerns the balance between them: relative potency at each receptor, and how that ratio shapes the observed metabolic profile in study models.
Handling and storage
Lyophilised material is stable for extended periods when kept sealed, dry, and away from light. Long-term storage in research settings is commonly at -20°C, with short transit at ambient temperature considered acceptable for lyophilised powders.
Once reconstituted, solutions are refrigerated at 2-8°C and used within a limited window, as peptides in aqueous solution degrade far faster than in powder form. Repeated freeze-thaw cycles are avoided.
Reconstitution notes
Peptides in this catalogue are supplied lyophilised. In laboratory settings they are typically reconstituted with bacteriostatic or sterile water added slowly down the inside wall of the vial, never injected directly onto the powder pellet.
The vial is then left to dissolve on its own, or swirled gently. Vigorous shaking is avoided because mechanical shear can denature peptide chains and reduce measurable potency in subsequent assays.
Purity and batch testing
Every batch we list is accompanied by third-party analytical testing. The Certificate of Analysis linked on this page shows the lot number, HPLC purity trace, and mass spectrometry identity confirmation for the exact batch held in stock.
Purity figures quoted on this page are taken directly from that report rather than from a manufacturer datasheet, so what you read here matches the vial that ships.
Frequently asked questions
- Why is retatrutide described as a tri-agonist?
- It activates three separate receptors — GIP, GLP-1 and glucagon — with a single molecule, rather than the one or two targets engaged by earlier incretin peptides.
- Is this product for human consumption?
- No. Everything in the Fox Peptides catalogue is supplied strictly for in-vitro laboratory research use. It is not a medicine and is not for human or veterinary consumption.
- Do you provide a Certificate of Analysis?
- Yes. Each batch is third-party tested and the Certificate of Analysis for the lot currently in stock is linked directly on this page, showing HPLC purity and mass spectrometry identity confirmation.
- Where do you ship and how long does delivery take?
- We ship across the UK with tracked delivery. Orders are dispatched from the UK once payment clears, so there are no customs delays for UK customers.
- How do I pay?
- Checkout uses secure open-banking bank transfer. You approve the payment inside your own banking app, and your order is confirmed automatically once the transfer clears.