Steroids The Effect of Steroids on the Body Steroids are synthetic forms of the male hormone testosterone. Although steroids have several important medical uses they are also used illegally. They are used illegally to either bulk up muscle mass or reduce one's body fat. Steroids have numerous negative side effects, most of which are listed below. If not, assume the product is not tested.
Some chemicals change with age and can become more harmful.
If not, it should be assumed there are impurities.