do a search for further info. But mainly people use if for bulking, shuttle all the carbs, proteins, and fats where they need to go. While dieting, i think that may be dangerous because then it can become fatal depending on how hypoglycemic a person gets. Insulin to me is dangerous and you run the risk of stopping your own insulin production. Gains are minimal and definately outweigh the risks. That's why people try to get an "insulin spike" after a work out, or try to insulin mimickers that do somewhat the same thing but are much safer.