Niacin
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Niacin, (which is also known as nicotinic acid or vitamin B3), is a water-soluble vitamin. Nicotinamide is the metabolite of niacin and used by the body to form the coenzymes nicotinamide adenine dinucleotide phosphate (NADP) and nicotinamide adenine dinucleotide (NAD). None of the forms are related to the nicotine found in tobacco, although their names are similar.