I think I "peaked" at about 100 units/day right before I got my first period (around 15/16). I was on steroids at the time for another medical condition so not sure how valid that is. I must have been maybe 80 lbs at the most then so well over 2 units/kg. I ended up adding metformin and that worked well to reduce the amount of insulin needed. I don't think you can compare the amount of insulin adults need with the amount growing kids need. Now at 21, I am around 110 lbs. somewhat active, and use symlin and I use anywhere from 15 to 20 units/ day. I would use around 25-30 without the symlin. I eat a pretty high carb diet but need very little insulin with meals due to the symlin. I'm at about 75% basal.