Niacinamide, also known as nicotinamide, is a form of vitamin B3. It is found in many foods including meat, fish, milk, eggs, green vegetables, and cereals. Niacinamide is required for the function of fats and sugars in the body and to maintain healthy cells. Unlike niacin, niacinamide doesnt help treat high cholesterol. People use niacinamide to prevent vitamin B3 deficiency and related conditions such as pellagra. It is also used for acne, diabetes, cancer, osteoarthritis, aging skin, skin discoloration, and many other conditions, but there is no good scientific evidence to support most of these uses. Niacinamide can help build proteins in the skin and lock in moisture to prevent environmental damage. It can also help prevent B-3 deficiency, which can lead to disorders of the skin, kidneys, and brain. Niacinamide is available in topical products such as cleansers and moisturizers.