Niacinamide is a water-soluble form of vitamin B3 that supports the skin barrier, helps regulate sebum, and reduces hyperpigmentation and redness. It is widely used in concentrations of around 2–10% in skincare formulations.
| Reported effect | How often | Notes |
|---|---|---|
| Mild transient flushing or warmth | Uncommon | More associated with high concentrations or oral intake; usually brief. |
| Skin irritation, stinging, or redness | Uncommon | More likely at higher concentrations or on sensitive/compromised skin. |
| Allergic contact dermatitis | Rare | Documented but infrequent; presents as itching or rash. |
| Acne or breakouts | Rare | Occasionally reported, often linked to other formulation ingredients. |
Frequencies reflect typical cosmetic use reported in the literature, not a guarantee for your skin.