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A doctor may order a vitamin B12 level test if a person has any of the following: Suspected vitamin B12 deficiency According to researchers, in the USA, approximately Infants with vitamin B12 deficiency Pernicious anemia People with symptoms of pernicious anemia It often affects older adults or those who lack intrinsic factor

Nitrous oxide-induced vitamin B12 deficiency occurs when your body cannot get the vitamin B12 it needs because of nitrous oxide use

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Some studies suggest that your body may absorb cyanocobalamin slightly better than methylcobalamin