Here's a couple of articles that explains why it makes sense for athletes to use insulin and also why it doesn't.My friend was drafted by the Cleveland Browns a few years ago. He was a late round pick and wound up getting cut, but his short time in the NFL was a real eye-opener. He said a lot of players are on Human Growth Hormone, which everyone already suspects.
But he said the other thing that alot of players do is take insulin shots, which really surprised me. Now, I don't know much about insulin other than diabetics need to take shots of it and it breaks down sugar in your body, but I never heard of using it for performance enhancement. Does this make sense to anybody?
He isn't the type of guy to lie about stuff like this, so I'm sure it is either true, or he believes it to be true.
Athletes may be increasingly abusing insulin
http://www.newscientist.com/article/dn1129-athletes-may-be-increasingly-abusing-insulin.html
Why do some bodybuilders use insulin as a supplement?Insulin helps athletes in two ways. In bodybuilders, it works alongside anabolic steroids such as testosterone or human growth hormone to consolidate muscle tissue. Steroids spawn new muscle, and insulin prevents it from being broken down.
Insulin also bolsters stamina in middle-distance runners and other track performers by enabling them to load their muscles with glycogen "fuel" before and between events. To do this, athletes would need to take insulin and glucose simultaneously for a couple of hours, infusing them using a technique called a hyperinsulinaemic clamp.
http://www.ironmagazine.com/viewarticle-983.html
Question:
Why do some bodybuilders use insulin as a supplement?
Answer:
First, I'd hardly call synthetic insulin a "supplement." it is really a serious drug, not meant to be used by bodybuilders but those inflicted with insulin-dependent diabetes. Insulin is only available by prescription, but that has never stood in the way of muscle hungry bodybuilders that want a specific drug.
The reason that bodybuilders are interested in insulin lies in it's ability to cause the storage of greater amounts of carbohydrates and amino acids inside muscle cells. Insulin is both anabolic and anti-catabolic in nature, and can produce dramatic and rapid increases in the size and fullness of the muscles when used "correctly."
Insulin also has a synergistic effect with other bodybuilding drugs like growth hormone and steroids, each helping the other drug to work more efficiently.
I should also mention that because insulin is not detected by standard urinalysis testing, it is also a favorite among "natural" bodybuilders as well. Insulin, along with HGH, which is also undetectable, are used by many that compete in drug tested events. This is cheating at its worst of course.
Bottom line, synthetic insulin is a powerful and dangerous drug. When used "correctly" it can certainly enhance hypertrophy to astounding levels. Used incorrectly on the other hand, it can make you fat, or far worse, kill you.