Niacinamide is a derivative of Vitamin B3, which also exists in two other chemical forms: niacin and nicotinamide riboside. It is essential for the proper functioning of the body. As an active ingredient, niacinamide is suitable for both mature skin to reduce signs of ageing, and for young and oily skin (+) to regulate sebum and limit imperfections. In this article, you will find some opinions on this multifunctional ingredient.