In the human body, peptides perform a lot of essential functions including the engagement of peptide hormones like insulin, glucagon-like peptide-1 (GLP-1), and glucagon and in blood glucose regulation and are used to treat novel targets for certain disease conditions, including Alzheimer’s disease, diabetes mellitus type 2, and obesity [4,5,6,7]. Here, GCG is linked to obesity due to melanocortin 4 receptor deficiency.