Niacinamide is a water-soluble B vitamin derivative used in skincare and nutrition. Chemically, it is the amide form of niacin (nicotinic acid) and functions as a coenzyme in cellular energy production. In cosmetics, it helps with barrier function and anti-inflammatory properties, while in nutrition it contributes to metabolism and DNA repair. It is pronounced with three syllables and emphasizes the second syllable slightly.
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