Cyanocobalamin

Cyanocobalamin is a stable synthetic form of vitamin B₁₂ in which a cyanide group is bound to the cobalt-containing cobalamin molecule. It is used in supplements and medicines to prevent or treat vitamin B₁₂ deficiency.

Cobalamin: Cobalamin is a family of cobalt-containing compounds with vitamin B₁₂ activity. Cyanocobalamin is one member of this broader family of vitamin B₁₂ forms.
Vitamin B₁₂ deficiency: Vitamin B₁₂ deficiency is a state in which inadequate cobalamin disrupts blood-cell production and nervous-system function. Preventing and correcting this deficiency is cyanocobalamin’s primary clinical purpose.
Hydroxocobalamin: Hydroxocobalamin is a naturally occurring cobalamin form used as a vitamin B₁₂ medicine and cyanide antidote. It is retained longer after injection and is commonly preferred for deficiency treatment in some countries.
Vitamin B₁₂: Vitamin B₁₂ is a group of cobalt-containing nutrients needed for red blood cell formation and nervous-system function. Cyanocobalamin is a manufactured member of this essential vitamin group.
Intrinsic factor: Intrinsic factor is a stomach-produced protein that enables vitamin B₁₂ absorption in the terminal ileum. It binds dietary B₁₂ and supports the absorption route used by oral cyanocobalamin.
Megaloblastic anemia: Megaloblastic anemia is anemia marked by abnormally large, immature red-cell precursors, often due to B₁₂ or folate deficiency. Cyanocobalamin treats the form caused by vitamin B₁₂ deficiency.
Methylcobalamin: Methylcobalamin is a coenzyme form of vitamin B₁₂ with a methyl group bound to cobalt. Unlike cyanocobalamin, it is already a coenzyme form, though the body can use either source.
Dorothy Hodgkin: Dorothy Hodgkin was a British chemist who determined the structures of complex molecules using X-ray crystallography. Her crystallographic work established vitamin B₁₂’s complex molecular structure.
Methylmalonic acid: Methylmalonic acid is a metabolite that can accumulate when vitamin B₁₂-dependent metabolism is impaired. Its blood concentration can help reveal functional B₁₂ deficiency despite cyanocobalamin use.
Vitamin B₁₂ injection: A vitamin B₁₂ injection delivers cobalamin by intramuscular or subcutaneous administration. Injectable cyanocobalamin bypasses intestinal absorption when oral treatment is unsuitable.

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