This book provides an overview of excipients, their functionalities in pharmaceutical dosage forms, regulation, and selection for pharmaceutical products formulation. It includes development, characterization methodology, applications, and up-to-date advances through the perspectives of excipients developers, users, and regulatory experts. * Covers the sources, characterization, and harmonization of excipients: essential information for optimal excipients selection in pharmaceutical development * Describes the physico-chemical properties and biological effects of excipients * Discusses chemical classes, safety and toxicity, and formulation * Addresses recent efforts in the standardization and harmonization of excipients