obsolete NADH metabolic process https://github.com/geneontology/go-ontology/issues/29050 true NAD (reduced) metabolism reduced NAD metabolism NAD (reduced) metabolic process reduced nicotinamide adenine dinucleotide metabolic process OBSOLETE. The chemical reactions and pathways involving reduced nicotinamide adenine dinucleotide (NADH), a coenzyme present in most living cells and derived from the B vitamin nicotinic acid. This term was obsoleted because it represents the same process as NAD+ metabolic process; GO:0019674. reduced NAD metabolic process reduced nicotinamide adenine dinucleotide metabolism biological_process NADH metabolism GO:0006734 NAD+ metabolic process