If you've noticed niacinamide showing up in nearly every serum on the shelf, there's a good reason: it's one of the few ingredients that's remained a steady staple year after year, genuinely delivering on two fronts—uneven skin tone and enlarged-looking pores—without the irritation risk that comes with harsher actives. Niacinamide, a form of vitamin B3, works by regulating oil production and strengthening the skin barrier, which is part of why it helps pores appear smaller over time: less excess oil means less stretching and visible congestion. At the same time, it inhibits the transfer of pigment within skin cells, gradually fading hyperpigmentation and evening out tone with consistent use.
What makes niacinamide especially appealing is how well it plays with other ingredients. Unlike some actives that require careful spacing to avoid conflict, niacinamide pairs easily with retinal, vitamin C, and other staples of a night time skincare routine, making it a low-risk addition for most skin types—including sensitive or aging skin that reacts poorly to stronger treatments.
Results tend to build gradually rather than overnight, with visible improvements in tone and texture typically showing up over several weeks of regular use—which is exactly why it's worth building into a routine rather than reaching for it occasionally.
Ready to add it to yours? SEOUL 1988's Niacinamide 15% Glow Serum delivers a concentrated dose for tackling tone and texture head-on, while the Niacinamide 5% Capsule Cream offers a gentler, moisturizer-friendly option for daily use.