Does niacinamide cause flushing?

Pure niacinamide at skincare concentrations rarely causes flushing. Flushing is associated with niacin (nicotinic acid), a different form of vitamin B3. Some early reports confused the two. At typical skincare concentrations of 2–10%, niacinamide is very well tolerated by most skin types including sensitive skin. If you notice any irritation, it is more likely due to another ingredient in the formulation.