Niacin is a water-soluble nutrient also known as nicotinic acid, or Vitamin B3. Nicotinamide, a derivative of niacin, is used to form coenzymes that are necessary for the functioning of about 200 different enzymes in the body. Inositol hexaniotinate, an inactive form of niacin, is sometimes sold as niacin in the form of a supplement.

Rich dietary sources of niacin include beets, brewer`s yeast, beef organs, fish such as salmon, swordfish, and tuna, sunflower seeds, and peanuts. In the U.S., breads and cereals are also commonly fortified with niacin.

In this model, carbon atoms are dark gray, hydrogen atoms are white, nitrogen atoms are blue, and oxygen atoms are red.

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