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Both start at a dose intended to be well below the therapeutic threshold, primarily serving as an acclimation period for the GI system
Because 10 to 30 percent of older people may be unable to effectively absorb vitamin B 12 naturally occurring in foods, those older than 50 years should meet their RDA mainly by consuming foods fortified with vitamin B 12 or a supplement containing vitamin B 12
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Before a first injection, a provider should review your history, current medications, and the contraindications above
Peake, J.M., et al
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