Niacin, also known as vitamin B3 (nicotinic acid), is one of eight B vitamins. Like all B vitamins, niacin plays a role in converting carbohydrates into glucose, metabolizing fats and proteins, and keeping the nervous system functioning properly. Niacin also helps the body produce hormones related to sex, stress, and improves blood circulation and cholesterol levels. So which foods are rich in niacin? This article will provide you with information about 16 common foods in daily meals that are rich in niacin.