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Key Takeaways Vitamin B12 is essential for red blood cell production, DNA synthesis, and brain function, with dietary sources primarily from animal products, making supplementation vital for vegetarians and vegans
Paraesthesia (pins and needles) in the hands and feet often improves within two to four weeks, though complete resolution may take several months
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Without intrinsic factor, the small intestine cannot efficiently absorb dietary B12 through the normal receptor-mediated pathway
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