What is RETA GLP-3?

“RETA GLP-3” is a nickname used online for retatrutide (also known as LY3437943), an investigational synthetic peptide designed to activate three hormone receptors involved in metabolic regulation: GLP-1, GIP, and the glucagon receptor. Reuters+1

Retatrutide is not approved for general medical use and is being evaluated in late-stage clinical trials for obesity and related metabolic conditions. Reuters+2ClinicalTrials+2

Why it is being studied

Researchers are studying triple-agonist therapies like retatrutide to better understand and potentially influence:

appetite and satiety signaling
glucose regulation and insulin dynamics
energy expenditure and lipid handling Reuters

How it works (mechanism overview)

Retatrutide is designed to engage three pathways at once:

1) GLP-1 receptor activity

supports glucose-dependent insulin secretion
contributes to satiety signaling and reduced food intake
slows gastric emptying (which can affect post-meal glucose dynamics) Reuters

2) GIP receptor activity

can further augment glucose-dependent insulin response
is being explored for its role in metabolic regulation when combined with other incretin pathways Reuters

3) Glucagon receptor activity

is studied for its potential role in energy expenditure and lipid metabolism when paired with incretin activity Reuters

What clinical research has reported so far (high level)

Across clinical research programs, retatrutide has been reported to produce meaningful changes in body weight and cardiometabolic markers, though outcomes vary by population, dose, and study design. Reuters+1

In a randomized phase 2a trial in people with metabolic dysfunction-associated steatotic liver disease (MASLD), retatrutide was associated with large reductions in liver fat compared with placebo, alongside reductions in body weight and waist circumference in that study population. Nature

Chemical identifiers (public registries)

Generic name: retatrutide
Synonym / code: LY3437943
CAS: 2381089-83-2
UNII: NOP2Y096GV
Molecular formula: C221H342N46O68
Molecular weight: ~4,731 Da precision.fda.gov

Important note

Because retatrutide is investigational, it should be handled and discussed in the context of legitimate research and regulated clinical development, not as an approved consumer product. The Verge+1

Sources (different from the ones you used)

ClinicalTrials.gov study records for retatrutide in obesity/overweight and type 2 diabetes ClinicalTrials+1
Nature Medicine phase 2a MASLD trial Nature
FDA GInAS substance record (UNII NOP2Y096GV) precision.fda.gov
Reuters reporting on late-stage trial results and program status Reuters
2025 review discussing triple-agonism therapies Springer Link

Quality & Research Standards

Every Prax Peptides research compound is manufactured in a certified facility and independently verified by a third-party lab to meet or exceed 99% purity. Each batch ships with a Certificate of Analysis documenting identity, purity, and mass-spectrometry results. We ship the same business day for orders placed before our cutoff, with discreet packaging and temperature-protective materials for every order.

Helpful Research Tools

New to working with lyophilized peptides? Use our free Peptide Reconstitution Calculator to determine accurate reconstitution volumes and per-unit dosing for any research compound. Pair your order with bacteriostatic water or a reconstitution solution for proper handling. Explore the full catalog on our research peptides shop.