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What are some side effects of taking B12 supplements?

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Quick Answer

When taken at the suggested dosage, there are no side effects associated with B12 supplements, notes Drugs.com. For people who have a high number of red blood cells, also known as polycythemia vera, taking vitamin B12 can unmask the symptoms, according to WebMD.

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Full Answer

Vitamin B12 creates new blood cells, and people who take chloramphenicol might not receive the benefits of taking a B12 supplement, states WebMD. People who have an allergy or sensitivity to cobalt or cobalamin must not take B12 supplements. Some people might have a sensitivity to B12 supplements used to treat eczema or psoriasis because they contain avocado oil.

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