The simplified comparison is this: Semaglutide: GLP-1 receptor activity Tirzepatide: GIP and GLP-1 receptor activity Retatrutide: GIP, GLP-1, and glucagon receptor activity under clinical investigation More receptor activity does not automatically mean a medication is better for every patient
Additionally, semaglutide acts on appetite centers in the brain, reducing hunger and promoting satiety, which contributes to significant weight loss in many patients

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Semaglutide (Ozempic, Wegovy): Once-weekly injection, produces robust weight loss (~15% in STEP-1 trial)