Keep in mind, we are not addressing the carbs you need to cover the insulin and how to time that but so you are aware, basic rule of thumb is to consume 10g carbs per 1iu insulin but people can get away with less. So back to how. It depends on your goals how often I would suggest using it but I would not go higher than 10 per shot and if you are using Log or Humalin R, No more than 2x day in an off season, first thing and then again pre or post workout as long as you have enough time left in your day to eat and cover your insulin doses. I would start small and build from there. Maybe 3iu in just one shot. Then go up 1iu a day, making sure you have enough carbs to cover it. You will probably find that 5iu is plenty to help increase your pumps and put on a good amount of water and fullness. Then as that no longer works as well, you could up the dose by 1iu, then see how you do. I would use it for no longer than 4 wks at a time like this in an off season. then take a few week break.