Does melatonin cause darkness in skin? I took melatonin for a week and my skin turned a little dark. Will my skin color remain dark or will the effect

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Melatonin can cause some skin pigmentation in a very very small percentage of individuals taking it.

It is an antioxidant and also protects the skin from ultraviolet damage.

But it is unlikely that only 1 week of usage has caused it . Most individuals taking melatonin have not complained of pigmentation. The effects can be reversed by using lightening products with formulations that inhibit the pigment formation.