Insulin can be dangerous, yes but if you do your research and eat 10-15 g carbs for every unit it can also be a game charger. Imo growth and insulin are the best products to use to put on size and keep it. I started with 4iu and worked up to 12iu but I don't use it everyday and the pumps are insane. I eat a nice meal the go to gym do a shot and sip on dextrose 100grams fast acting carbs while I train never had an issue but also I'd never take it without 100g fast acting carbs either.