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B12 levels are up and I feel better
For individuals with severe B12 deficiency (especially those with anaemia or neurological symptoms), some might start to feel an improvement in their energy levels within a few days to a week
Persistent nausea can create a general sense of malaise that patients describe as fatigue, while the physical effects of frequent vomiting or diarrhea can cause legitimate exhaustion
Its a common assumption that anyone who can draw blood can also insert an IV line
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