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3 Rare But Serious Side Effects of Vitamin B12 Supplements How Quickly Does B12 Shot Work? Does It Help to Lose Weight? B12 overdose: Signs, causes, and how to manage it Vitamin B12 Deficiency: Vitamin B12 deficiency is a nutritional or absorption related disorder leading to impaired DNA synthesis and neurologic dysfunction, commonly presenting with megaloblastic anemia and neuropsychiatric symptoms. Physiological
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