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For most patients, high-dose oral B12 supplements are as effective as intramuscular injections
The phrase "not enough data" means something specific here: no human trial in this age group, no safety signal study in pubertal animals, and no pharmacokinetic data to support any dose
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It's also used as part of a test called the Schilling Test, which is the way doctors will check for vitamin B12 deficiency
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