Insulin can be taken on the plane, but we should pay attention to the following points. Firstly, if insulin is put in the luggage and checked in with the luggage when traveling on the plane, it is likely that the insulin will be invalidated due to low temperature. Secondly, it is recommended to bring insulin, syringes and doctor’s prescription to avoid unnecessary troubles in preserving insulin. Once again, the temperature in the cabin is not very high when you fly, so don’t worry, as long as the temperature does not exceed 30℃. As for the cautions of insulin, the insulin that has been packed in the pen after opening cannot be put back into the refrigerator, because in the case that the needle is not removed, the thermal expansion and contraction of insulin will inhale air and form bubbles, causing the inaccuracy of the injection amount, resulting in unstable blood sugar, so it is not necessary to put insulin in the refrigerator during business trips or at home. For unopened insulin, it is recommended to store it in the refrigerator’s freezer at 2-8℃, and it should be noted that it should not be placed in the freezer below 0℃. Because insulin is a small molecule protein, the hypoglycemic effect will be destroyed after freezing, if there is no refrigerator should be placed in a cool place, and should not be stored for a long time.