vitamin B12 vitamin B12 chebi_ontology vitamin B12 vitamer Any member of a group of cobalamin vitamers that exhibit biological activity against vitamin B12 deficiency. Vitamin B12 deficiency is associated with low red blood cell count and anemia. The vitamers are found in foods such as cereals, meat, fish, and poultry. The vitamers include adenosylcobalamin, hydroxocobalamin, cyanocobalamin, aquacobalamin, nitritocobalamin and methylcobabalamin (also includes their ionized, salt and phosphate derivatives). vitamin B12 vitamers vitamins B12 CHEBI:176843 vitamin B-12 organonitrogen compound