Vitamin PP (vitamin B3). Niacin and niacinamide are the two main forms of vitamin B3. Both substances are key in releasing energy from carbohydrates, processing alcohol, forming fats, and producing sex hormones. A significant benefit of niacin is its ability to prevent recurrent heart attack. Niacin also helps regulate cholesterol levels. A third form of niacin, inositol hexaniacinate, is gaining acceptance as a substitute for niacin. Inositol hexaniacinate is composed of one molecule of inositol (an "unofficial" B vitamin) and six molecules of niacin
Good Food Sources: Peanuts, brewer's yeast, fish, and whole grains.
Signs of Deficiency: Signs of niacin deficiency include fatigue, irritability, insomnia, blood sugar fluctuations, arthritis, diarrhea, loss of appetite, an inflamed tongue, and digestive problems. Niacin deficiency is rare in western cultures, largely because niacin is added to white flour, and Americans consume a great deal of these products.
Uses of Niacin: : Niacin is used to treat depression.