Melanin is a pigment produced by our melanocytes, Panax ginseng is commonly used to increase cognitive functions, and creatine is a molecule naturally found in our body commonly used as a booster for athletic performances. According to the Natural Medicines Comprehensive Database melatonin is likely effective for delayed sleep phase disorder, the condition of having trouble falling asleep at the same time, and it's possibly effective for jet lag and insomnia. Melatonin is a hormone produced by the pineal gland, triggered by the darkness, and it acts on the hypothalamus, regulating the sleep-wake cycle.
The correct answer is D.
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