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injectable b12 vs oral Injections vs. Supplements: Which Is Better? Oral vitamin B12 versus intramuscular
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[22] The injections are usually given in a clinic setting, but in some cases patients may be taught to self-administer at home under medical guidance

This includes vegans and vegetarians, older adults, individuals with atrophic gastritis, pernicious anemia, gastrointestinal disorders, those who have had gastrointestinal surgery and people who take certain medications including, but not limited to, estrogen (HRT), and birth control pills

doi: 10.1016/j.tem.2016.06.010 40 YoshidaTSemprun-PrietoLSukhanovSDelafontaineP

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