Testosterone, the notorious male hormone has been surrounded by many dark rumors for several decades, leading to the avoidance of it by numerous health care professionals and patients. However, recent research has shown that the data with regard to several side effects reported in the past are mostly inaccurate and that the benefits of testosterone replacement therapy reach far beyond the restoration of libido, and include many vital body functions which are impaired when testosterone levels decrease. This book reveals the multiple pathways by which testosterone benefits the male in order to widen the outlook of new and innovative potential applications of testosterone replacement therapy in a broad range of fields.