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no controlled study has ever compared its oral and subcutaneous bioavailability head-to-head, and no human pharmacokinetic data exist at all
If your schedule is urgent or you are close to running out, contact a healthcare professional rather than relying on shipping timing to start or continue treatment
If accompanied by anemia, then injections
This protein is needed for B12 to be absorbed in the stomach
PubMed record Xu B, et al
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