What are the warnings for Vitamin B12?

The most important warning for vitamin B12 is to be sure to talk to your doctor before taking supplements of this nutrient (or any dietary supplement). Although vitamin B12 supplements are generally considered to be safe, they can interact with other medications you might take.

For example, if you take certain antibiotics at the same time as vitamin B12 supplements, the antibiotics may be less effective and the vitamin B12 may be less well-absorbed. You need to take them separately. Other medications that may interfere with your body's ability to absorb vitamin B12 from supplements include antacids and ulcer medications, cholesterol-lowering drugs, antiseizure medications, chemotherapy drugs, the diabetes treatment glucophage (Metformin), and others.

For maximum absorption and to keep B vitamin levels in balance, some doctors also recommend taking vitamin B12 as part of a B-complex supplement. Talk to your doctor about what is best for you.

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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.