After completing my research, I found that insulin stored at 37oC did not significantly differ in blood glucose–lowering performance compared to insulin stored at 5oC.1 Regardless, the temperature at which insulin is stored should be kept as low as possible and I suggested that the patient store the insulin in a lunch bag that had a reflective coating on the inside and maintain a lower temperature using instant ice packs (so that the environment for the insulin would be kept cold when he needed it to be).