There is a lot to know with insulin. It is not a beginner or intermediate drug. It can be used safely and effectively, and cause massive gains; however, you need to know what the hell you're doing. You need to monitor your blood sugar levels constantly. You need to know what type of insulin you're using, and the active window. You need to know the different types of carbs, and how much of each type will raise your blood sugar and by how much. You need to gauge your tolerance because some are more sensitive than others. It's scary as hell to go hypo, and it's easier than you might think. It's also much more effective with HGH since the two together have a synergistic effect and release more igf-1.