Niacinamide, also called nicotinamide, is a form of vitamin B-3, an essential nutrient. A B-3 deficiency can lead to disorders of the skin, kidneys, and brain. Taking niacinamide can help prevent B-3 deficiency. And there’s much more to this nutrient, especially when it comes to general skin health. Although more research is needed, topical niacinamide may help treat certain skin conditions, including...