Insulin is a very important hormone in terms of our health and body’s proper function. As a performance tool it can really aid in building muscle quite unlike many hormones, but its use is risky. Even without the risk of death, many men will have a very difficult time controlling their body fat with this hormone. Most men will never need it for performance related goals and will be far happier with their physique in the long run if they avoid it. However, it still has an appeal for many men. It is very popular and commonplace in high level competitive bodybuilding circles, both amateur and professional. But keep in mind, such individuals are often genetic freaks who are also using massive amounts of other hormones that aid in the process. The standard every day gym rat that uses performance enhancing hormones will get fat with exogenous insulin use.