Melatonin Water Soluble is an indoleamine neurohormone whose levels vary in a daily cycle, thereby allowing the entrainment of circadian rhythms in various biological functions in animals, plants, and microbes. This water-soluble form of melatonin facilitates absorption into the body, providing support for natural sleep patterns. Its effects are transduced through melatonin receptors, including the MT1, MT2, and MT3 subtypes. Melatonin also upregulates enzymes such as glutathione peroxidase, superoxide dismutases, and catalase, contributing to its biological effects.