melatonin |
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| navigate by keyword : aging anti antioxidant chemical chemistry circadian clock cycle daily dietary feverfew gland hormone hypericum insomnia jet lag melatonin melatonine molecule molekuul neurohormone parthenium perforatum pineal rythm seasonal serotonin structure supplement tanacetum tryptophan |
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| A molecule of melatonin, a hormone that plays an important role in regulating the circadian rythm. |
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