Anabolic steroids are a class of natural and synthetic steroid hormones that promote cell growth and division, resulting in growth of several types of tissues, especially muscle and bone. Different anabolic steroids have varying combinations of androgenic and anabolic properties, and are often referred to in medical texts as AAS (anabolic/androgenic steroids). Testosterone is the most potent natural anabolic steroid, while dihydrotestosterone is the most potent natural androgen. Anabolic steroids are often used by athletes as performance enhancing substances.
Examples of anabolic effects:

Medlineplus Drug Information: Anabolic Steroids (Systemic) - Information for patients in html format.
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