Retatrutide vs Tirzepatide
Both molecules belong to the incretin family studied in metabolic research, but they do not engage the same set of receptors. The difference is one pathway — and that pathway is the reason the two are so often compared.
Receptor engagement, side by side
| Receptor | Retatrutide | Tirzepatide |
|---|---|---|
| GLP-1 | Engaged | Engaged |
| GIP | Engaged | Engaged |
| Glucagon (GCG) | Engaged | Not engaged |
GLP-1. Associated with satiety signalling, slowed gastric emptying and glucose-dependent insulin release.
GIP. Studied alongside GLP-1 for insulin response and how adipose tissue handles nutrients.
Glucagon (GCG). Linked in research to energy expenditure and hepatic fat metabolism. This third target is the defining difference.
How the two differ in practice
- Class
- RetatrutideTriple agonist (GLP-1 / GIP / glucagon)
- TirzepatideDual agonist (GLP-1 / GIP)
- Development stage
- RetatrutideInvestigational — late-stage clinical trials, no marketing authorisation
- TirzepatideLicensed as a medicine in several territories under prescription
- Published trial signal
- RetatrutidePhase 2 data reported substantially greater mean body-weight reduction over 48 weeks than earlier agonist classes
- TirzepatidePhase 3 programmes reported large, sustained weight reduction versus placebo
- Why researchers compare them
- RetatrutideTo isolate what the added glucagon pathway contributes on top of dual agonism
- TirzepatideServes as the established dual-agonist reference point
- UK status on this site
- RetatrutideSupplied strictly for laboratory, in-vitro and scientific research use only
- TirzepatideNot supplied by RETA MED
Trial outcomes above summarise published, peer-reviewed clinical research into these molecules as investigational or licensed medicines. They are reported here as context for researchers and are not claims about any product supplied on this site.
The triple agonist we supply for research
Our Retatrutide 40mg pen dials from 2.5mg to 10mg, ships with needles and wipes, and must be refrigerated once opened. It is supplied strictly for laboratory, in-vitro and scientific research use only — not for human consumption.