Does niacinamide cause purging?
Niacinamide is not a classic purging active like a retinoid or strong BHA. New bumps after starting it are more often irritation, a rich base formula, or coincidence with another new product — not true purge from faster cell turnover.
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If redness or itching appears, lower the strength or pause. True comedones that appear only along the hairline may be the moisturizer vehicle. Introduce one new product at a time so you can tell which caused the change.
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What does niacinamide do?
Niacinamide is a form of vitamin B3 widely used in Korean skincare to help brighten the look of dullness, refine the appearance of pores and support the skin barrier. It's gentle, well tolerated by most skin types and pairs easily with many other ingredients.
Can you use vitamin C and niacinamide together?
Yes, current understanding is that vitamin C and niacinamide can be used together safely, and many Korean formulas combine them. The old warning that they cancel out is largely outdated. If your skin is sensitive, you can still apply them at different times of day to be cautious.
Can I use retinol with niacinamide?
Yes — many people use niacinamide and a retinoid in the same routine. If you are new to retinoids, buffer with moisturiser and keep acids off that night. Stinging means simplify, not push harder.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed: 2026-09-07.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.