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Melatonin is a ubiquitously distributed molecule that possesses diverse functions. Melatonin plays a key role in the endogenous circadian rhythms of humans via light stimulation in the hypothalamus. In addition, melatonin has roles in the opioid system, the nitric oxide pathway, free radical scavenging, inflammation, and antinociception. Melatonin is nontoxic and relatively safe. Recently, exogenous melatonin has been shown to have significant effects in the treatment of migraine. Further, it has demonstrated efficacy in the treatment