Vitamin B3
Vitamin B3 is niacin, also known as nicotinic acid. The metabolically active forms of niacin are the pyridine nucleotides, nicotinamide adenine dinu-cleotide (NAD) and nicotinamide adenine dinu-cleotide phosphate (NADP) [65]. Free forms of the vitamin are white stable crystalline solids [65]. Only small amounts of the free forms of niacin occur in nature [65]. Most of the niacin in food is present as a component of NAD or NADP [65]. Pellagra is the clinical manifestation of niacin deficiency.
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