has role has role water-soluble vitamin (role) organonitrogen compound organooxygen compound nutraceutical B vitamin PMID:23449527 PMID:23238962 B vitamins MetaCyc:B-vitamins B-group vitamin CHEBI:75769 Any member of the group of eight water-soluble vitamins originally thought to be a single compound (vitamin B) that play important roles in cell metabolism. The group comprises of vitamin B1, B2, B3, B5, B6, B7, B9, and B12 (Around 20 other compounds were once thought to be B vitamins but are no longer classified as such). Wikipedia:B_vitamin PMID:23093174 PMID:22743781 PMID:23690582 chebi_ontology B-group vitamins PMID:23462586 vitamin B