Emergence of lifestyle diseases, e.g., type II diabetes, cancers, obesity, cardiovascular disorders, liver cirrhosis, etc., are exponentially increasing day by day. Modern drifts toward the utilization of herbal medicines in different healthcare aspects necessitate (demand) the replacement of synthetic molecules with phytoconstituents because of their biocompatibility, biodegradability, economic extraction process, and ready availability from the natural source. This book provides a thorough insight into the comprehensive and up-to-date trends of phytomedicines in the management of lifestyle diseases and its mechanisms, modern methods of extraction and purification of phytoconstituents, and chemical characterization as well as standardization of phytoconstituents using modern equipments.