I went to America a few months after being diagnosed and I was so concerned.... You need a letter from you GP saying you are diabetic and a prescription. I took two lots of supplies, one in my hand luggage and my friend had the other. On the flight it was put in the fridge (I know that I didn't need to do that now). Insulin is safe to use within 30 days of refrigeration unless it appears cloudy. I had a great time and everyone thought I was amazing coping so well. It's true, I am amazing, we all are xx