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Who should not take B12?

Because it is not quite clear if B12 causes harm to a developing fetus, pregnant women should take B12 with extreme caution. People with the conditions hemochromatosis or hemosiderosis should not take B12 because of the possibility of iron overdose. People with Leber's disease (an inherited eye disorder) should not take B12 as it may worsen the disease considerably.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.