Niacin is a B vitamin preciously known as Vitamin B3 or Nicotinic Acid. This is a required Vitamin in the human body and generally occurs naturally in Plants and Animals. The use of Niacin as nutrition supplement in food items is very frequent. The vitamin is very much necessary for the lowering of Cholesterol in the blood and reduction of risk of heart attack, as well. However, an overdose of Niacin in the human body may become fatal and it has to be addressed immediately.