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Deficiency is particularly common in elderly people, because the ability to absorb vitamin B12 can decrease with age
Convenience: Supplements are easier for daily self-management
I felt more alert and energized after receiving one B12 injection
A smaller group feels briefly worse first: tired, achy, headachy or off-colour for a day or two
Side Effects: In individual cases: Sweating , tachycardia and skin reactions
Symptoms of low B-12 may include fatigue, trouble concentrating, low mood, or even neurological changes
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