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For those with a B12 deficiency and an MTHFR mutation, one major advantage of B12 injections is that they are readily absorbed in the body and do not have to be taken as often as oral tablets
If you find your case unmanageable, its best to consult with a doctor for guidance
However, it can be harmful when taken in excess amounts
Not even a single case could be found in some populations where more traditional diets are eaten (i.e., minimally processed, high-carb, low-fat diets)
Vitamin B12 Fact Sheet for Health Professionals
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