Mounjaro and Zepbound are both tirzepatide. Same molecule, different approved indications, different dosing pathways.

PT-141 (Bremelanotide) and Melanotan II share the melanocortin receptor family but with distinct selectivity profiles.

A no-jargon overview of how GLP-1 peptides like Ozempic and Mounjaro actually work — written for researchers explaining the mechanism to non-specialists.