Nicotinamide

Can Niacinamide Cause Acne? Why This K-Beauty Star Ingredient Might Be Breaking You Out

Niacinamide shows up in nearly every Korean skincare product, from serums to sunscreens. But for a surprising number of people, it triggers cystic acne and breakouts. Here's what's actually going on and how to build a K-beauty routine that works without it.