Retatrutide
Synthetic triagonist peptide that simultaneously activates the GLP-1, GIP and glucagon receptors. Developed by Eli Lilly; in phase-3 trials for obesity (TRIUMPH programme) and type 2 diabetes. No marketing approval yet.
Mechanism of action
Retatrutide is a 39-amino-acid peptide with agonism at three incretin/energy-balance receptors: GLP-1R (insulin secretion, satiety), GIPR (insulin sensitivity, lipid metabolism) and the glucagon receptor (energy expenditure, lipolysis). The added glucagon activation is intended to raise catabolic energy expenditure while concurrent GLP-1/GIP action compensates the hyperglycaemic effect. Albumin binding via a fatty-acid side chain enables weekly dosing.
Evidence at a glance
What the studies show
Where studies disagree
Do the record-high weight losses of the triple agonist outweigh possible risks?
Pharmacokinetics
Theoretical concentration curve at a half-life of 144 h. Pure pharmacokinetic model — not a dosing recommendation.
Open in PK tool →Routes of administration in the literature
Amounts reported in sources
Safer use & risks
Known adverse events from studies
Interactions & combinations
Risks & hygiene aspects in the literature
Early data, long observation pending
Anecdotal observations
Legal status by country
Reconstitution calculator
Peptides ship as a dry powder. Once dissolved in a liquid (reconstitution), this calculator answers a single question: how much substance is in one millilitre of solution afterwards?
- 1Enter the vial's substance amount (printed on the label).
- 2Enter how much solvent you add.
- 3Result = concentration in mg per mL.
Cofactors
These cofactors relate to the peptide class, not to a specific use. No recommendation, no dosing.
Study register
Triple-hormone-receptor agonist retatrutide for obesity — a phase 2 trial
Retatrutide, a GIP/GLP-1/glucagon receptor agonist, for people with type 2 diabetes — a phase 2 trial
Retatrutide for hepatic steatosis in adults with metabolic dysfunction-associated steatotic liver disease — a phase 2 trial
LY3437943, a novel triple glucagon, GIP, and GLP-1 receptor agonist for glycemic control and weight loss: from discovery to clinical proof of concept
TRIUMPH Phase-3 Programme — A Study of Retatrutide (LY3437943) in Participants With Obesity
Sources & method
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