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Also known as vitamin B3 and nicotinic acid, niacinamide is a very effective skin-restoring ingredient that offers multiple benefits for aging skin. Among these benefits is the ability to visibly improve the appearance of enlarged pores, uneven skin tone, fine lines, dullness, and a weakened skin surface. Niacinamide can also mitigate the damage environmental attack can cause, and is stable in the presence of heat and light.
Source: Paula´s Choice.
Reference：藥妝品學 Cosmeceuticals, 2nd edition
Niacinamide is an essential B vitamin that helps soothe skin.
Niacinamide, also called nicotinamide and vitamin B3, is a water-soluble vitamin. Working with the substances naturally found in the skin, niacinamide can help repair a compromised skin barrier while improving the appearance of skin.
Niacinamide causes painfull cystic acne in my skin. :(