Research-focused information regarding pharmacognosy, the field of medicines derived from natural sources, is provided in this book. The book presents an overview of the developments in the field of pharmacognosy with the aim of drug discovery from natural products, applying traditional knowledge and practices. Several herbs that have been used as food show their potential as chemopreventive agents and the assertions of various medicinal plants used in traditional medicine are now supported by science. This book is an efficient guide which will help us find medicinal solutions for all.