The freeze-dried material should be stored at -18C. NNC9204-1702 can be dosed in vivo in a formulation vehicle containing 50mM sodium phosphate, 145mM propylene glycol, (0.007% polysorbate 20 if concentrations are so low that adsorption to vials may affect the concentration), pH 7.4. Stability in aqueous media is poor thus formulations should be used fresh. For in vitro it is recommended to dissolve human glucagon in 100% DMSO and keep at max 5C. Peptides and proteins have a tendency to adhere to glass and plastic surfaces. This may at low concentration impact the actual amount in solution. To minimize this unspecific adherence, adding detergents or inert proteins like e.g., ovalbumin or other serum albumins to the solution can minimize this phenomenon. In case albumins are added to peptide/protein solutions, ensure that the albumins are free of any proteases.