There have been an increasing number of young people who have turned away from natural body building in favor of artificial growth hormones and steroids. Everything that the world has learned about performance enhancing substances have been left behind in favor of a quick-fix type of solution.
Many celebrities like California Governor: Arnold Schwarzenegger have spoken out and published articles about health problems associated with steroid use (Arnold had a bypass surgery years ago to repair a damaged valve in his heart). As science evolves, better ways are found to beat the testing systems in place for competition, which makes illegal substances more tempting to try.
Go Natural
Natural body building will only better your lifestyle and life expectancy, when combined with a nutritional diet low in processed foods. Going the other route means always worrying about if you will get caught (if you're a competitive athlete) and generally not knowing what will become of your health 10 or 20 years down the road.
Going the natural body building route will also give you the confidence of knowing that you don't need pills or injections to feel strong. You've gotten where you are with whatever you were put on this earth with, and your brain -- rather than walking around feeling like a science project.
People who use illegal performance enhancers are also prone to bouts of uncontrolled aggression, lack of concentration and severe hormone deficiencies when they have to quit using the drugs. Jose Canseco has made his hormone problems public, to try and warn young people to go the natural route (his body is barely able to produce testosterone after years of steroid abuse).
The only side effects of natural body building are: better health, stronger muscles, "natural" self confidence and health soreness.