I have not used insulin during my precontest phase becuase I dont have growth and am hesitant to use it with just anabolics due to not coming in as lean as I would like. However would the use of insulin over the three day carb up be a decent idea since it is not being used for an extended time and fat gain would not happen. I don't carb load heavily 300-400 grams have worked effectively for me in the past so I was thinking 10IU per 100 grams of carbs.........T