PEG-MGF is present in lyophilized powders. You will need to buy PEG MGF in a vial form alongside your insulin or 1 ml syringes and sterile or bacteriostatic water. Experts suggest incorporating 1 ml of sterile water to every 2 mg PEG MGF vial. You may store your excess solution in the refrigerator for up to 6 months. PEG MGF vials that have not been reconstituted should be store in room temperature areas. Avoid exposing it to sunlight or heat.