Niacinamide

About: Niacinamide, also called nicotinamide, is a form of vitamin B-3, an essential nutrient found in food and used as a dietary supplement and medication.

What It Contains: vitamin B

Advantage: It's good for all skin types. Keeping skin smooth and moisturized may have a secondary benefit — a natural reduction in pore size over time.

Benefit: It reduces inflammation, which may help ease redness from eczema, acne, and other inflammatory skin conditions. It supports the skin barrier (the outer surface of skin), increases its resiliency, and improves texture by making pores look smaller. It also helps balance oil production.