Nicotinamide, , is the amide of nicotinic acid, with a pyridine ring bearing a carboxamide group. It is one form of vitamin B3 and supplies the nicotinamide unit of nicotinamide adenine dinucleotide and nicotinamide adenine dinucleotide phosphate.[ref]
PubChem Compound database by National Center for Biotechnology Information. Nicotinamide, CID 936, molecular formula and structure
These coenzymes connect its structure to metabolism: the nicotinamide ring participates in reversible electron transfer between oxidized and reduced forms. Incorporation into a coenzyme is different from the free nicotinamide molecule itself carrying out every associated reaction.[ref]
Niacin Fact Sheet for Health Professionals by the Office of Dietary Supplements. Cellular functions and formation of NAD and NADP
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