Some athletes and bodybuilders use so-called "dietary supplements" that are legal, unregulated substances in the United States. These substances are not subject to the same testing for safety and effectiveness as all over-the-counter and prescription medications in the . Most of their effects are believed to be hugely overstated by their marketers, but no one really knows what the effects might be. In addition, no one really knows what their dangers might be. On of these supplements is called Andro. It is a legal substance that the body converts into testosterone, a regulated steroid. How efficiently this converted testosterone might be used is unknown. Scientists have not been able to prove that Andro creates desirable effects. In addition, it may be as harmful as other types of testosterone and synthetic testosterone.