Now in its fourth edition Testosterone: Action, Deficiency, Substitution provides the most up-to-date and comprehensive source of information on testosterone and its role in human physiology and pathology. It covers biosynthesis and mechanisms of action and reviews their effects on brain and behavior, spermatogenesis, hair growth, bones, muscles, erythropoiesis, the cardiovascular system and the prostate. The therapeutic uses of testosterone preparations are carefully evaluated as well as its abuse and detection in competitive sport. This new edition also devotes sections to exploring the effects of testosterone on female physiology and sexual function, and the experimental use of testosterone in male hormonal contraception. Testosterone: Action, Deficiency, Substitution has been written and edited by world experts in the fields of clinical andrology and endocrinology and provides a unique and invaluable guide for andrologists, endocrinologists, urologists, internists and those working in reproductive medicine.