Niacinamide is a skincare darling—and with good reason. This gentle yet powerful form of vitamin B3 offers a multitasking boost to your skin, from calming redness and regulating oil to supporting your barrier and brightening tone. Clinically proven and remarkably well-tolerated, niacinamide continues to be trusted by dermatologists and formulators alike as one of the most valuable and versatile ingredients in skincare.