Lyophilized Insulin is stable at room temperature for 3 weeks, but it is recommended that it is store desiccated at -20 degree C. After reconstitution, it can be stored at 4 degree C for 2-7 days but should be stored below -20 degree C after that. For long-term storage of reconstituted Insulin, it is recommended that a carrier protein (such as 0.1% HAS or BSA) is added.