Retatrutide is an investigational drug that acts as a triple-receptor agonist, targeting receptors for glucose-dependent insulinotropic polypeptide (GIP), glucagon-like peptide-1 (GLP-1), and glucagon. This multi-pronged approach distinguishes it from earlier generation medications that often target only one or two of these pathways. It is being developed primarily for the treatment of obesity and related metabolic conditions.
The GIP, GLP-1, and glucagon receptors are integral to metabolic regulation. GIP and GLP-1 are incretin hormones that, among other effects, stimulate insulin secretion in a glucose-dependent manner, suppress glucagon secretion, slow gastric emptying, and promote satiety. Glucagon, broadly known for its role in increasing blood glucose, also has complex metabolic effects that, when modulated by agonists like retatrutide, may contribute to energy expenditure and fat utilization. By activating all three receptors, retatrutide aims to leverage these synergistic effects to achieve significant improvements in weight management and glycemic control, as described in early clinical trials (Eli Lilly and Company announcements, clinical trial registries). As an injectable compound, its dose is user-directed and must be set by a licensed clinician.
Deep dive
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Known interactions
Category rule: glp1 × supplement
Note
GLP-1 medications slow stomach emptying, changing how/when oral supplements absorb; rapid weight loss raises the importance of protein and micronutrients.
Time oral supplements when nausea is lowest; prioritize protein and micronutrients; discuss with your provider.
Compound-pair rule
Caution
Combining a GLP-1 with rapid insulin increases hypoglycemia risk.
Reduce mealtime insulin at GLP-1 initiation; monitor glucose closely.
Compound-pair rule
Caution
GLP-1 plus basal insulin increases hypoglycemia risk.
Reduce basal insulin dose 10–20% at GLP-1 initiation and titrate.
Frequently asked
Sources referenced
["Eli Lilly and Company (Manufacturer announcements and clinical trial presentations)","MedlinePlus (For general information on metabolic hormones)","Mayo Clinic (For general information on obesity treatment and metabolic conditions)","PubChem (For chemical compound information)","DrugBank (For drug mechanism and interaction principles)","The New England Journal of Medicine (For publications on related incretin therapies)"]
Stackwise compiles summaries from publicly available scientific and regulatory references. Always verify important decisions with a licensed clinician.
Related compounds
Others in the glp1 category or studied for the same goals.