Side-by-Side Comparison · 2026

Retatrutide vs Semaglutide

Retatrutide vs Semaglutide — mechanism, half-life, dosing, and research status compared. Which is right for your protocol?

Retatrutide
Metabolic / Triple Incretin Agonist

Retatrutide is a first-in-class GLP-1/GIP/glucagon triple receptor agonist by Eli Lilly. Phase 2 trials demonstrated up to 24.2% weight loss at 48 weeks - surpassing all previously approved agents. Phase 3 trials actively enrolling for obesity and type 2 diabetes....

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Semaglutide
Metabolic / GLP-1 Agonist

Semaglutide is a long-acting GLP-1 receptor agonist approved for type 2 diabetes and chronic weight management. It mimics endogenous GLP-1 to enhance insulin secretion, suppress glucagon, slow gastric emptying, and reduce appetite centrally. Once-weekly subcutaneous dosing; clini...

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Key Parameters
Parameter Retatrutide Semaglutide
Category Metabolic / Triple Incretin Agonist Metabolic / GLP-1 Agonist
Research Phase 3 Clinical Trials FDA Approved
Half-Life ~6 days ~168 hours (7 days)
Typical Dose 1-24 mg/week (Phase 2); Phase 3 doses TBD 0.25-2.4 mg/week (SC); 3-14 mg/day (oral)
Frequency Once weekly Once weekly (SC); once daily (oral)
Route Subcutaneous injection Subcutaneous injection; oral tablet
FDA Status Phase 3 (obesity, T2D); not yet approved Approved (T2D, obesity)

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Frequently Asked Questions
What is the difference between Retatrutide and Semaglutide?
Retatrutide: Retatrutide is a first-in-class GLP-1/GIP/glucagon triple receptor agonist by Eli Lilly. Phase 2 trials demonstrated up to 24.2% weight loss at 48 weeks - surpassing all previously approved agents. Ph... Semaglutide: Semaglutide is a long-acting GLP-1 receptor agonist approved for type 2 diabetes and chronic weight management. It mimics endogenous GLP-1 to enhance insulin secretion, suppress glucagon, slow gastric...
Which has a longer half-life, Retatrutide or Semaglutide?
Retatrutide half-life: ~6 days. Semaglutide half-life: ~168 hours (7 days).
Can you stack Retatrutide and Semaglutide?
Retatrutide and Semaglutide are sometimes used together in research protocols. Always consult relevant literature and follow appropriate guidelines.

For research use only. Not medical advice. ASCEND does not conduct or endorse any specific research protocol. Always consult relevant scientific literature and regulatory guidelines.