Niacinamide is a form of vitamin B3 and one of the best-studied, best-tolerated actives in skincare. It reduces excess oil, calms redness, strengthens the skin barrier and fades dark marks. Most people tolerate 4–10% well.
Niacinamide is regarded as one of the safest actives — reported side effects are mild and uncommon.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient irritation, redness or stinging | Uncommon | Usually mild and resolves with reduced frequency or lower concentration; more likely at higher concentrations. |
| Flushing | Rare | More associated with oral niacin than topical niacinamide; topical flushing is uncommon. |
| Allergic contact dermatitis | Rare | Occasional reports; patch testing recommended for sensitive individuals. |
| Dryness or peeling when combined with other actives | Uncommon | Often related to layering with retinoids, acids or over-exfoliation rather than niacinamide alone. |
Frequencies describe how often effects are reported in the literature for typical cosmetic use — not a guarantee for your skin. Patch-test a new active, and stop if irritation persists.
4–10%
AM and/or PM, daily
Most actives, incl. vitamin C and retinoids
'Niacinamide + Vitamin C cancel out' — not true for modern forms