While supplementing with up to 2,000 mcg of B12 is considered safe for treating deficiencies, it is advisable to consult a healthcare professional to determine if supplementation is necessary, especially if you are taking medications or are pregnant
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Bibcode:1994ApEnM..60.1495K
Indications and Usage for B-12 Compliance Injection Cyanocobalamin is indicated for vitamin B12 deficiencies due to malabsorption which may be associated with the following conditions: Addisonian (pernicious) anemia Gastrointestinal pathology, dysfunction, or surgery, including gluten enteropathy or sprue, small bowel bacteria overgrowth, total or partial gastrectomy Fish tapeworm infestation Malignancy of pancreas or bowel Folic acid deficiency It may be possible to treat the underlying disease by surgical correction of anatomic lesions leading to small bowel bacterial overgrowth, expulsion of fish tapeworm, discontinuation of drugs leading to vitamin malabsorption (see DRUG INTERACTION), use of a gluten-free diet in nontropical sprue, or administration of antibiotics in tropical sprue
When you take a B12 pill, it has to go through your digestive system, where much of the vitamin can be lost before your body can use it
