MARTIN SHIELDS / SCIENCE PHOTO LIBRARY MARTIN SHIELDS / SCIENCE PHOTO LIBRARY
Packets of Androgel, a prescription testosterone transdermal gel supplement. Testosterone, an androgen, is an important male steroid hormone that influences secondary sex characteristics, sex drive and the building of muscle mass. The supplement is used by elderly men with declining testosterone production (andropause) or those who require supplementation for medical reasons. The gel is sometimes used illegally by individuals trying to increase muscle mass and endurance for athletic performance purposes.
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