Vitamin B3 is a vitamin that includes three forms: nicotinamide (niacinamide), niacin (nicotinic acid), and nicotinamide riboside. All three forms of vitamin B3 are converted within the body to nicotinamide adenine dinucleotide (NAD). NAD is required for human life and people are unable to make it within their bodies without one of the vitamin B3 or tryptophan. Nicotinamide riboside was identified as a form of vitamin B3 in 2004. The group is also occasionally referred to as vitamin B3 complex.
- Stipanuk, Martha H.; Caudill, Marie A. (2013). Biochemical, Physiological, and Molecular Aspects of Human Nutrition - E-Book. Elsevier Health Sciences. p. 541. ISBN 9780323266956.
Vitamin B3... potentially includes three different molecular forms: nicotinic acid, niacinamide, and nicotinamide riboside
- Silvestre, Ricardo; Torrado, Egídio (2018). Metabolic Interaction in Infection. Springer. p. 364. ISBN 978-3-3197-4932-7.
Niacin or nicotinate, together with its amide form nicotinamide, defines the group of vitamin B3 complex
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