“The line between enhancement and cheating is a fine one because only anabolic steroids are banned universally. (Some sports organizations, such as the U.S. Olympic Committee, are strict, banning everything from excessive caffeine to certain cough medicines; other governing bodies, such as Major League Baseball and the National Basketball Association, are lenient.) Anabolic steroids are synthetic versions of the male hormone testosterone, which can significantly build lean muscle mass, boost speed and endurance and accelerate recovery time. Steroids are illegal because they give the user results he or she could not get in a lifetime of training. But they also have been deemed a serious health risk, with side effects including increased aggression, sexual dysfunction, infertility and liver and heart damage that, in severe cases, can lead to death.”