還有美白的作用

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.

在黑色素合成之後，抑制黑色素小體轉移

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. :(