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Una Hopkins, RN, FNP-BC D et al (2013) Large-volume IM injections: a review of best practices

This is because even without an ileum, it is estimated that 1% of total absorption of vitamin B12 is by passive diffusion throughout the small intestine

methylcobalamin Vitamin B 12 appears to have only two functions in eukaryotes: as a cofactor for the enzymes: Methionine synthase MethylmalonylCoA mutase Sources of vitamin B12 Vitamin B 12 is in the gastrointestinal tract of animals and is then absorbed by the host animal

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Here are a few things to keep in mind: Minor discomfort