Steroid
Certain anabolic steroids, such as testosterone, are used to help make muscles stronger.  Such steroids are used to improve a person's performance, but they are sometimes overused and abused by athletes.  The rate of steroid abuse grew greatly in the early 21st century, all over the world.  Overuse of anabolic steroids can have bad effects on the human body.  They can cripple or kill. Sports organisations now regulate their use.