Plant secondary metabolites are organic compounds that aid in the growth and development of plants but are not required for the plant to survive by fighting off herbivores, pests, and pathogens. These plant secondary metabolites have been used since early times in various medicines and food products for beneficial health purposes and are still relevant and popular today. This new three-volume Plant Secondary Metabolites provides an abundance of valuable information on secondary metabolites, their health properties and possibilities, and their extraction and application methods.