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This is because the vitamin itself binds to proteins, which are abundant in those foods

Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper

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For patients who could achieve the same results with oral supplementation, the cost difference is substantial and worth discussing with your provider

Both oral cyanocobalamin and injectable hydroxocobalamin list diarrhoea as a rare adverse reaction in UK product information

If your refrigerator consistently runs above 46F, potency loss accelerates