Abstract: The inventions relate generally to vesiculin peptides and vesiculin peptide chains, and fragments, variants and derivatives thereof, related compositions and formulations and their preparation and use, nucleic acids encoding such vesiculin peptides and vesiculin peptide chains, and fragments, variants and derivatives thereof and related vectors and host cells, hybridomas and antibodies, and methods for the prevention and treatment of conditions, diseases and disorders that would be improved, eased, or lessened by the administration of a composition of the invention, including but not limited to glucose metabolism diseases.