For these reasons, peptides are considered alternative therapeutic approaches for various pathologies, including neurological disorders [94]: PACAP, a neuroprotective peptide [95], p8, an inhibitor of the protease that cleaves the APP precursor and generates Aβ amyloid [96], and liraglutide, a peptide analog of glucagon-like peptide 1 [97]. Here, GCG is linked to nervous system disorder.