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or This 3D medical animation provides an overview of the normal activity of testosterone and the pathology and treatment for men with abnormally low testosterone level. 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. Treament options can be in the form of an injection, patch, gel, or tablet.