Numerous types of medications exist for controlling diabetes, including metformin, sulfonylureas, thiazolidinediones (TZD), insulin, dipeptidyl peptidase-4 (DPP-4) inhibitors, alpha-glucosidase inhibitors, glinides and glucagon-like peptide-1 (GLP-1) agonists5. Here, GCG is linked to diabetes mellitus.