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Iron deficiency leads to anemia, causing fatigue and a general lack of energy
B12 injections bypass the digestive system entirely, delivering a full dose into the bloodstream immediately
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
Fatigue and weakness: Feeling tired and lacking energy after adequate rest
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