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[3] The speed of response depends on multiple factors including the severity and duration of deficiency, the presence of neurological complications, and individual metabolic differences
When to Seek Help: What If I Don't Feel Better
Vitamin B12 shots can often undo symptoms of a low vitamin B12 level but the issue is that you might not have any idea that your B12 levels are low to begin with
Oral: 2-4 weeks
Vitamin B12 injections begin working almost immediately at a cellular level, though the timeframe for noticeable symptom improvement varies considerably between individuals
B12 injections can be more effective than pills in patients who have trouble absorbing vitamin B12, says Foxx
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