The therapies and applications of steroids have been elucidated in this profound book. It contains information about contemporary fundamental science on steroids and their research work as well as their practical application for medicinal purpose. It begins with the description of physiological and pathophysiological roles of steroids, with reference to action and production of gonadal steroids, sex specific and steroids-dependent mechanism of hippocampal function, role of steroid sulfonation and the hydroxysteroid dehydrogenases for the alteration of tissue glucocorticoid availability. The book also talks about various aspects of application of steroids in clinical environment, like drawback of use of steroids in sports, endocrine function post ovarian transplantation, correlation between serum cortisol and salivary responses after alcohol intake, diagnostic importance of salivary assessment of androgens and analysis of serum steroid hormone profiles in patients suffering from adrenocortical tumors. The aim of this book is to provide comprehensive and useful information about this interesting and fast-growing scientific discipline.