Disclosed herein are solid compositions that comprise sincalide and are storage stable and which lack a buffer, and optionally, also lack a surfactant/solubilizer, wherein such compositions are storage stable. Also disclosed herein are liquid compositions that comprise sincalide, wherein such compositions are storage stable, and may lack buffer and/or surfactant/solubilizer. Also provided are methods of making and administering the solid or liquid storage stable compositions to a patient in need of, e.g., for the treatment, prevention, and/or diagnosis of gall bladder- and/or pancreatic disorders; or other diagnostic imaging.