Retatrutide — Research Evidence & Community Data
Also known as: LY3437943, triple agonist, GGG agonist
Research & educational use only. This content is not medical advice. Consult a qualified healthcare professional before using any peptide compound.
What Is Retatrutide?
Retatrutide is an investigational triple agonist of the GIP, GLP-1, and glucagon receptors being developed for obesity and type 2 diabetes. Phase 2 randomized controlled trials reported among the largest weight reductions seen for an incretin-based therapy, and phase 3 trials are underway. It is not FDA-approved and is not available as a finished prescription product.
Is Retatrutide FDA Approved?
Retatrutide is phase 3 trials. It is treated as a research compound in the United States with no approved human clinical applications.
What Does the Research Show?
As of 2026, there are 2 human randomized controlled trials with a combined 700 subjects, and 10 animal model studies. Phase 2 randomized controlled trials reported large mean weight reductions; phase 3 program is ongoing. Not yet approved.
| Study | Type | Subjects | Outcome | Source |
|---|---|---|---|---|
| Triple-hormone-receptor agonist retatrutide for obesity - a phase 2 trialJastreboff AM, et al. · New England Journal of Medicine · 2023 | RCT | 338 | Large dose-dependent mean weight reduction at 48 weeks | DOI |
What Do Community Logs Show?
No community logs include Retatrutide yet. Browse community logs →
How Is Retatrutide Used in Research?
Mechanism of action. Simultaneous agonism of GIP, GLP-1, and glucagon receptors, affecting appetite, insulin secretion, and energy expenditure.
Half-life. Supports once-weekly administration.
Storage. Investigational; no approved finished product.
Reconstitution. No approved finished product. Reconstitution math applies only to lyophilized material - not medical advice. See the reconstitution calculator — a math tool only, not dosing guidance.
What Does Retatrutide's Evidence Tier Mean?
Retatrutide is rated Tier 1 · RCT Evidence. Supported by human randomized controlled trials. Evidence tiers are a shorthand for how strong the human data is — Tier 1 reflects human randomized controlled trials, while lower tiers rest on observational, animal, or theoretical evidence. A higher tier means more confidence that observed effects are real and caused by the compound rather than by chance or bias. For how to weigh each tier, see our guide to understanding peptide evidence tiers.
How Do You Evaluate Retatrutide Sourcing and Quality?
Because research-chemical Retatrutide is unregulated, sourcing quality varies widely between sellers. Before trusting any supplier, check its reputation and enforcement history in the ranked list of trusted peptide sellers, and look for a batch-specific certificate of analysis (COA) showing third-party HPLC or LC-MS purity testing. Purity claims without a named lab, a batch number, and a method are marketing, not data. If you are reconstituting lyophilized material, the reconstitution calculator handles the arithmetic — it is a math tool only and not dosing guidance.
Where to Buy Retatrutide: Trusted & Verified Sellers
Retatrutide is supplied by specialist research-chemical sellers rather than pharmacies, so where you buy it matters as much as what you buy. The sellers below have published moderator-approved third-party lab results for Retatrutide, ranked by overall reputation score. Always confirm a current batch-specific COA before purchasing.
No seller has published a lab result for Retatrutide yet. Browse the ranked directory of trusted peptide sellers and check each one's lab testing and enforcement record before buying.
PeptidesHub does not sell Retatrutide or facilitate transactions — this list is for research transparency only.
How Are Adverse Reactions to Retatrutide Reported?
Structured adverse-event reports help the whole community spot safety signals early. You can browse approved reports on the adverse events page or submit one yourself. For a serious or life-threatening reaction, seek medical care and report it to FDA MedWatch.
Frequently Asked Questions
Retatrutide is phase 3 trials. It is treated as a research compound in the United States.