The Case for Tirzepatide, Properly Understood Tirzepatide is the active ingredient in Mounjaro, the branded medication produced by Eli Lilly. It is what clinicians call a dual receptor agonist, meaning it works on two gut hormone pathways at once. The first is the GLP-1 receptor (glucagon-like peptide-1). Activating this receptor slows gastric emptying, reduces appetite signalling to the brain, and improves the body's insulin response to meals. This is the same mechanism that