The study of botany and the use of medicinal plants fall under the science of herbalism. Throughout human history, plants have been used for the treatment of diseases and ailments. Many of the pharmaceuticals used today have a history of use as herbal remedies, such as quinine, aspirin, digitalis and opium. Modern medicine uses plant-derived compounds for the development of evidence-based pharmaceutical drugs. The scope of herbal medicine may extend to incorporate fungal and bee products, shells, animal parts and minerals. Herbal remedies are prevalently used in patients with chronic diseases like diabetes, cancer, end-stage renal disease and asthma. Prescription drugs are used along with herbal extracts, herbal teas and essential oils. This book traces the progress of herbal medicine and highlights some of its key principles and practices. It includes some of the vital pieces of work being conducted across the world, on various herbal medicines. Those in search of information to further their knowledge will be greatly assisted by this book.