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Melatonin is best known as a sleep hormone because of its action controlling the circadian cycle. But melatonin also has antioxidant properties, and may have an important anti-aging role.
A recent study looked at artificially aged mice to determine the effects of melatonin on aging. Such mice are used as a model to study the fundamental mechanisms of aging because they develop markers also found in neurodegenerative diseases like Alzheimer's.