This volume covers the latest techniques that study the synthesis of melatonin, its receptor function, and its effects at the cellular and systemic level. The chapters are organized into three parts. Part One describes methods for the detection of melatonin and its biological derivatives in various biological samples, the manipulation of melatonin synthesis by the pineal gland in animals, and the principal source of melatonin in mammals. Part Two explores methods to measure the biological effects and consequences of melatonin binding to high-affinity G protein-coupled receptors. Part Three describes methods to measure the physiological effects that are regulated by melatonin in animals, particularly in rodent models. Written in the highly successful Methods in Molecular Biology series format, chapters include introductions to their respective topics, lists of the necessary materials and reagents, step-by-step, readily reproducible laboratory protocols, and tips on troubleshooting and avoiding known pitfalls. Cutting-edge and thorough, Melatonin: Methods and Protocols is a valuable resource for any researcher interested in investigating melatonin, from its production to its mechanisms of action and systemic effects.