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Having a lack of intrinsic factor (IF) , a substance that binds to B12 so it can be absorbed into the bloodstream (5)
Delivered under the skin or into a muscle, bypassing the gut
Recovery considerations Recovery takes longer during caloric restriction
contraindicated in anyone with copper-handling disorders
Cyano B12 in particular should be avoided, especially in patients with pernicious anemia and/or with high homocysteine
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