Translations:Vitamin B12/4/en
| bioavailability = Readily absorbed in distal half of the ileum.
| protein_bound = Very high to specific transcobalamins plasma proteins.
Binding of hydroxocobalamin is slightly higher than cyanocobalamin.
| metabolism = Liver
| elimination_half-life = Approximately 6 days
(400 days in the liver).
| excretion = Kidney