Niacinamide is a water-soluble form of vitamin B3 that works as a gentle, multi-tasking ingredient to support overall skin health. What It Does Strengthens the skin barrier: It boosts the production of ceramides to lock in moisture and block out irritants. Regulates oil production: It helps control sebum (skin oil), which reduces greasy shine and makes pores look smaller. Fades dark spots: It blocks pigment transfer to lighten hyperpigmentation and even out skin tone. Calms redness: It reduces inflammation linked to acne, rosacea, and general irritation. Smooths fine lines: It supports collagen production to improve elasticity and firmness.