This book provides information on testosterone and its role in human anatomy, physiology, psychology and pathology. In particular, it proposes articles on testosterone biosynthesis and metabolism peculiarities; on the regulation of dominant behaviour; on cognitive and emotional factors and the cardiovascular system involving testosterone and on androgen suppression mechanisms during stress. The book includes topics on the therapeutic effects of testosterone and effective methods of detecting androgens in the human body and presents a variety of clinical, experimental, theoretical and review articles. This collection gathers the latest research from around the world in this field and will be of value for researchers studying the effects of hormones, as well as for androgen deficiency therapists.