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Maturation of red blood cells from the immature megaloblasts produced in bone marrow is dependent on Vitamin B12, which is a precursor for co-enzyme B12 involved in important enzyme reactions in the production of components of folic acid, which in turn is essential for DNA synthesis

Thats why I say its intriguing. Despite such logical reservations, I asked more than a dozen people I interviewed about side effects and heard only a few anecdotes about minor issues (in one case, stomach problems caused by an athlete screwing up dosages with a mislabeled vial)

B12 overdose symptoms include skin rashes, itching, upset stomach (nausea, vomiting, diarrhea), b12 overdose headache, and feeling anxious or nervous

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