Niacin is also used for preventing positive urine drug screens in people who take illegal drugs. Niacinamide is used for treating diabetes and two skin conditions called bullous pemphigoid and granuloma annulare. Niacin or niacinamide is used for preventing vitamin B3 deficiency and related conditions such as pellagra.Vitamin B3 is found in many foods including yeast, meat, fish, milk, eggs, green vegetables, beans, and cereal grains.Niacin and niacinamide are also found in many vitamin B complex supplements with other B vitamins. Niacin is used for high cholesterol.People who consume higher amounts of niacin from food and multivitamin sources seem to have a lower risk of getting Alzheimer's disease than people who consume less niacin.
Niacin and niacinamide are easily dissolved in water and are well-absorbed when taken by mouth. Niacin and niacinamide are required for the proper function of fats and sugars in the body and to maintain healthy cells. Some people use niacin or niacinamide for acne, leprosy, attention deficit-hyperactivity disorder (ADHD), memory loss, arthritis, preventing premenstrual headache, improving digestion, protecting against toxins and pollutants, reducing the effects of aging, lowering blood pressure, improving circulation, promoting relaxation, improving orgasm, and preventing cataracts. Niacinamide is applied to the skin for treating a skin condition called inflammatory acne vulgaris.