Niacin (vitamin B3) is found in dairy products, fish, poultry, lean meat, nuts and eggs. Cereal, enriched bread and legumes also supply some niacin. Niacin is important in assisting in the functioning of the digestive system, skin and nerves. It also assists in the conversion of food to energy. Niacin deficiency causes pellagra. Symptoms include inflamed skin, digestive problems, and mental impairment.
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