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Vitamin B12 deficiency from the perspective of a practicing hematologist
However, "safer" and "better" are not the same thing
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Before taking, speak with your doctor if you are allergic to vitamin b12, have a genetic condition called optic atrophy, have blood in your urine, polycythemia, an ongoing infection, low iron or folate levels, are pregnant or plan to become pregnant, are breastfeeding or plan to breastfeed
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