What Is Niacinamide? The Ingredient in Almost Everything, Explained
A form of vitamin B3, water soluble and well tolerated, used for the look of a more even skin surface.
On the label
Niacinamide, sometimes nicotinamide. Percentages on the front are a selling point; more is not better past a modest amount.
What it does not mean
It does not shrink pores permanently or brighten skin the way people mean when they say brighten. It evens how the surface looks.