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Cobalamin

Chemical compound
Vitamin B₁₂, also known as cobalamin, is a water-soluble vitamin involved in metabolism. It is one of eight B vitamins. It is required by animals, which use it as a cofactor in DNA synthesis, and in both fatty acid and amino acid metabolism. Wikipedia
AHFS/Drugs.com: Monograph
ATC code: B03BA01 (WHO)
Bioavailability: Readily absorbed in distal half of the ileum
Elimination half-life: Approximately 6 days; (400 days in the liver)
Excretion: Kidney
License data: US DailyMed: Vitamin_b12
Metabolism: Liver