Definition of cyanocobalamin in US English:



  • A vitamin found in foods of animal origin such as liver, fish, and eggs, a deficiency of which can cause pernicious anemia. It contains a cyanide group bonded to the central cobalt atom of a cobalamin molecule.

    Also called "vitamin B12" (see vitamin B)
    • ‘A synthetic form, called cyanocobalamin, is used to fortify foods and make dietary supplements in the United States.’
    • ‘A deficiency of any of the following B-vitamins: folio acid, cyanocobalamin or pyridoxine can cause an increase in blood levels of homocysteine.’
    • ‘At the time of this writing, cyanocobalamin is a widely available form of injectable vitamin B 12, whereas hydroxocobalamin can be obtained only through a compounding pharmacist.’
    • ‘The actual increase in cobalt could be entirely attributed to the cobalt content of the cyanocobalamin that was added to the infusion.’
    • ‘The B-complex vitamins are actually a group of eight vitamins, which include thiamine, riboflavin, niacin, pyridoxine, folic acid, cyanocobalamin, pantothenic acid and biotin.’


1950s: from cyanogen and cobalamin (blend of cobalt and vitamin).