However, vitamin B12 deficiency is serious as it can lead to anemia and worse when left untreated
The intramolecular disulfide bond between its two cysteine residues is believed to be important for maintaining its active conformation
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In people without pernicious anemia, about 0.5 g/day of B12 is reabsorbed by enterohepatic circulation in which B12-containing bile is secreted by the liver into the digestive tract where the B12 is then reabsorbed via intrinsic factor
