I am not diabetic, but I have been using 20 ius of Humulin R. I normally take this M-F, after my morning workout. I started taking 2 ius per day, and have worked up to 20ius @ 215 pounds. The only noticed side affect at 20ius, for me, is I feel tired up to 90 minutes after taking it. After that window, everything is back to normal. My glucose reading after 2 hours is ~100. I do find it necessary to consume ~1000 calories after the 20ius, with 200 of these being protein and the rest carbs. I've seen many different reports on insulin use, and reccomendations on how much to use, so I thought I would share my personal experience with it. Comments and/or reccomendations welcomed.