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This video, created by Nucleus Medical Media, shows the normal activity of testosterone and treatment for men with abnormally low testosterone levels. Deficiency of this male hormone may result in a condition called androgen deficiency, or hypogonadism, which may include increased body fat, reduced muscle size, and swollen breasts. Testosterone replacement therapy is the administration of man-made testosterone to restore a healthy hormone level in the blood and to relieve symptoms. Treatment options can be in the form of an injection, patch, gel, or tablet.