For years, niacinamide has been positioned as one of skincare’s safest bets. Gentle, barrier-supportive, suitable for nearly every skin type — or so we’re told. It appears in cleansers, serums, moisturizers, sunscreens, even makeup. And yet, more people than ever are reporting redness, stinging, breakouts, and sensitivity linked to products that prominently feature niacinamide. So […]