GLP3 (RETA) 10MG
RETA is a synthetic peptide known as a triple-receptor agonist, designed to target the glucagon-like peptide-1 (GLP-1), glucose-dependent insulinotropic polypeptide (GIP), and glucagon receptors. In laboratory research, it is utilized to investigate the coordinated regulation of glucose homeostasis, lipid metabolism, and energy expenditure through simultaneous multi-pathway signaling. For research use only.
- Triple-Agonist Metabolic Research: Investigated for its ability to activate three distinct incretin and metabolic receptors simultaneously to evaluate synergistic effects on energy balance.
- Energy Expenditure Studies: Studied for the role of glucagon receptor agonism in increasing resting energy expenditure and thermogenesis in animal models.
| Aspect | Details |
|---|---|
| Drug Class | Triple GLP-1 / GIP / glucagon receptor agonist (first-in-class triple incretin mimetic) |
| Mechanism of Action | Activates GLP-1 (appetite suppression, glucose control, gastric emptying delay), GIP (enhanced insulin secretion, metabolic synergy), and glucagon receptors (increased energy expenditure/fat burning, liver fat reduction, further appetite/energy regulation). This multi-target approach leads to greater weight loss, thermogenesis, and metabolic improvements than dual or single agonists. |
| Administration | Subcutaneous injection (once weekly) |
| FDA Status (March 2026) | Investigational / Not approved. Phase 3 TRIUMPH program ongoing (multiple trials); TRIUMPH-4 topline released Dec 2025. Full Phase 3 readouts expected throughout 2026; potential NDA submission late 2026–early 2027, approval possibly late 2027 or later. Not available by prescription outside trials/compounded (grey-market risks high). |
| Dosing (in Trials) | Escalation starts low (e.g., 2 mg or 4 mg initial); maintenance: 4 mg, 8 mg, 9 mg, or 12 mg weekly (highest doses in Phase 3: 9 mg and 12 mg). Dose-dependent efficacy and side effects. |
| Key Clinical Trials & Weight Loss Efficacy | – Phase 2 (NEJM 2023, 48 weeks): Up to 24.2% mean body weight loss (12 mg dose) vs. ~2% placebo. – Phase 3 TRIUMPH-4 (topline Dec 2025, 68 weeks, obesity + knee OA, no diabetes): Up to 28.7% mean loss (12 mg; ~71.2 lbs / 32.3 kg from baseline ~248 lbs); 26.4% at 9 mg. ~58% achieved ≥25% loss, many ≥30–35%. Placebo ~2%. Superior to prior incretins. – Additional benefits: Up to 75.8% reduction in knee OA pain (WOMAC score), liver fat clearance (earlier data up to 82%). |
| Additional Benefits | Highest reported weight loss in trials; potent liver fat reduction (MASLD/MASH potential); knee OA pain relief; cardiometabolic improvements (BP, lipids); energy expenditure boost; potential for OSA, CVD, and other obesity complications (ongoing TRIUMPH trials). |
| Common Side Effects | Gastrointestinal (dose-related): nausea, vomiting, diarrhea, constipation (mostly mild-moderate, transient during escalation; mitigated by slow titration). Dose-dependent heart rate increase (peaks early, declines). |
| Serious/Rare Risks | Similar to incretins: pancreatitis, gallbladder issues possible. New signal in TRIUMPH-4: dysesthesia (abnormal/painful touch sensation) in 8.8–20.9% (dose-dependent; 0.7% placebo). High discontinuation rates (12–18% due to AEs, including perceived excessive weight loss). Thyroid concerns (rodent data, low human risk). |
| Typical Use Context | Emerging as potentially most potent for severe obesity, metabolic disorders, and complications (e.g., OA pain, liver disease). Still experimental; research focus on superior efficacy vs. semaglutide/tirzepatide. |
| Notes | Weight loss dose-dependent and sustained with continuation (regain likely on withdrawal). Tolerability challenges at high doses (higher discontinuations). Seven more Phase 3 TRIUMPH readouts expected in 2026. For research use only in non-trial settings—impurities/legality risks in grey market. |








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