TOPICS: B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folate), B12 (cobalamin, vitamin C, vitamin A, Vitamin D, Vitamin E, vitamin K, Hartnup disease, malnutrition, cofactor, dehydrogenase, transketolase, Wernicke-Korsakoff syndrome, alcoholism, malnutrition, cheilosis, FAD synthesis, tryptophan, NAD synthesis, transamination reactions, cystathionine synthase, DOPA decarboxylase, serotonin synthesis, niacin synthesis, GABA synthesis, heme synthesis, isoniazid, carboxylase enzymes, avidin, biotin, THF, megaloblastic anemia, homocysteine, methylmalonic acid, methionine synthase, methylmalonyl-CoA mutase, subacute combined degeneration (SCD), collagen, keratomalacia, isotretinoin, all-trans retinoic acid (ATRA), acute promyelocytic leukemia (APL), rickets, osteomalacia, clotting, red blood cells (RBCs), amino acid transporter deficiency, pellagra, kwashiorkor, marasmus, apolipoprotein synthesis