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Because B12 levels arent checked during routine blood work, a deficiency can go undetected for years, Dr
The honest answer is that it depends, and it depends most on whether you are actually deficient
Most people feel a noticeable energy boost within 24 to 72 hours, especially if they were deficient
Severity of deficiency: if your levels were very low, it may take several doses to fully restore your tissues, or you may feel a dramatic early difference because your body was so depleted
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