Niacinamide (B3): effective % & pH 나이아신아마이드
How much Niacinamide (B3) actually works? Here's the dosage, pH and evidence — the formulator-level read behind the % on a Korean label.
| Effective % | 2–5% |
|---|---|
| Optimal pH | 5.0–7.0 |
| Evidence | Strong |
| Onset | 4–8 weeks |
What the % on the label really means
A label listing 2–5% niacinamide is in the well-supported sweet spot; a '10%' product is not twice as good and may simply read as more irritating.
Niacinamide (B3) guide →How Niacinamide (B3) works →
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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 The old warning that they cancel out is largely outdated.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.
✍️ Written & reviewed by the KoreaPlus Editorial team — dermatologist-informed, cosmetic-science researched & source-cited. Last reviewed 2026-06-21.
General educational information using cosmetic structure-function wording — not medical advice. Always patch-test new actives. © KoreaPlus.