Niacinamide
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Niacinamide, also called nicotinamide, is a form of vitamin B-3, an essential nutrient. Niacinamide can help your skin grow a lipid barrier, which can, in turn, help retain moisture. It causes a natural reduction in pore size over time. It can concurrently rebuild healthy skin cells while also protecting them from damage caused by ultraviolet rays. It also helps with severe acne.