Niacin Best Antioxidante Envejecimiento Deshidratación Niacin description Niacin, also known as nicotinic acid, is one of two types of vitamin B3, the other being niacinamide. Like niacinamide, it is an anti-ageing ingredient with potent antioxidant benefits. Related ingredients: Nicotinic Acid Niacinamide Nicotinamide Vitamin B3