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The peptide contains an intramolecular disulfide bridge between two cysteine residues, which constrains its three-dimensional structure
People who have had intestinal surgery, such as weight loss surgery, or who have digestive disorders, such as celiac disease or Crohns disease, which may reduce the amount of vitamin B12 the body can absorb
Hypersensitivity reaction to cyanocobalamin
2000;279(3):E501-E507
Conversely, if you are a vegetarian or vegan, you might need to rely more on B12 shots or supplements to maintain adequate B12 levels
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