Compound Spotlight Semaglutide vs Tirzepatide vs Retatrutide — A Researcher’s Guide to 3 GLP-1 Class Peptides Semaglutide Tirzepatide Retatrutide research represents the fastest-evolving area of metabolic peptide science. This complete guide compares all three compounds — their receptor profiles, mechanisms, research applications, and what makes each one the right tool for specific research designs. 📅