GCG and type 2 diabetes mellitus: There are several Food and Drug Administration (FDA)-approved treatments for T2D, including the first-line treatment metformin (Glucophage) [18] and the novel drug tirzepatide (Mounjaro) [19], a glucagon-like peptide-1 (GLP-1) and glucose-dependent insulinotropic polypeptide (GIP) receptor agonist [20,21].