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Key terms: deficiency occur vitamin levels pain pg spots absorption daily vitamin b anemia tingling symptoms supplements mc grams injections b deficiency concentration dietary treated your dv intrinsic factor diagnosis sublingual depression cyanocobalamin methylmalonic acid blind tufts university recent research nutritional intake doses animal products hereditary decreased synthesis irritability impaired absorption milk vegans elderly ileum intranasal mg fortified syndrome tongue disorder may occur Search external links cited by footnotes on Wikipedia page Vitamin B12 deficiency: |
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