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[Highlight] "NMN prevents excessive production of melanin pigment in aging melanocytes." Melanin production mechanism You've probably noticed blemishes dotting your face when you look in the mirror. This is due to melanin, which not only causes blemishes but also pigmentation such as freckles and dark spots. Melanin naturally acts as a defense mechanism, protecting the skin from external irritants. Specifically, it absorbs UV rays,...