The chemical reactions and pathways resulting in the formation of nicotinamide adenine dinucleotide (NAD+), a coenzyme that interconverts with its reduced form, NADH, in many redox and catabolic reactions. NAD+ is derived from various sources including vitamin B3. [PMID:28648096]
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C5: Ontology GO: Gene Ontology GO:BP: GO Biological Process