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Brain function Low levels of vitamin B12 have been linked to a decline in brain function
One week you feel fine, the next you are dragging through mornings, losing focus by mid-afternoon, and relying on caffeine just to keep up
Normally no, apart from an achy muscle at the injection site, which normally does not last for more than an hour or so
Another case involved an anaphylactic shock after a hydroxocobalamin injection
Usually, its 1000 mcg daily or weekly
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