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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
doi:10.1046/j.1526-4610.1998.3807547.x
B12 shots contain about 100 micrograms of B12, which is roughly 40 times the recommended daily value for an average healthy adult (2.4 micrograms)
Schauer, P
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