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Niacin (vitamin B3 or nicotinic acid) is a B vitamin helps the digestive system, skin, and nerves to function properly. It is also very important for converting food to energy. Like other B vitamins, It is water-soluble, which means it is not stored in the body. Unused amounts of niacin leave the body through the urine, which means that we need a continuous supply of B vitamins in the diet.