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For example, after a total gastrectomy, we recommend that patients get B12 supplementation often in the form of B12 injections for the rest of their lives
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Some types of edible algae and fermented foods may also contain small amounts, but they arent reliable sources
[36] Vitamin B 12 deficiency is most commonly caused by malabsorption, but can also result from low intake, immune gastritis, low presence of binding proteins, or use of certain medications
Ramamurthi, S., Obi, E
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