If you're the mother or father of an adolescent athlete, your life is probably as busy as your son's or daughter’s. It's important, however, to make time to talk to your adolescent about the dangers of performance-enhancing drugs and supplements. By setting rules and consequences and explaining the possible health effects of drug use, you can help your adolescent steer clear of performance-enhancing drugs and supplements. For adolescents, the most common performance-enhancing drugs and supplements include the following: Steroid precursors, such as androstenedione ("andro") and dehydroepiandrosterone (DHEA), are substances that the body converts into anabolic steroids. They're used to increase muscle mass. Most steroid precursors are illegal without a prescription. DHEA, however, is still available in over-the-counter preparations. Side effects of steroid precursors are similar to those for steroids. Creatine is a naturally occurring compound in the bod...