Anabolic ("muscle-building") steroids are man-made substances closely linked to the male hormone testosterone. These drugs are available by prescription only to treat certain medical conditions. They are only safe for use when taken under a doctor's care and supervision. Abuse of steroids — often in an attempt to gain more muscle mass — can lead to serious health problems, some of which are irreversible. Know the risks of steroid use.

Steroids and athletes.

Here's more information about steroids:

In the Iowa Youth Survey, 99% of Marshalltown 11th graders said they have never taken steroid pills or shots without a doctor's prescription.