Is tirzepatide a peptide?

Yes. Tirzepatide (Mounjaro/Zepbound) is a dual GIP/GLP-1 receptor agonist — a peptide that activates both the GIP and GLP-1 hormone receptors simultaneously. It is FDA-approved for type 2 diabetes and weight management and shows even greater weight loss in trials than semaglutide alone (average ~20-22% body weight loss in SURMOUNT-1).