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Vitamin B12 side effects and safety

In most cases Vitamin B12 is safe for almost everyone. If you use injectable or oral vitamin B12 correctly and if you follow the prescriptions of your doctor you are supposed to have no side effects at all.

But it should be mentioned that some people may have unpleasant side effects while taking B12:

  • serious allergic reactions
  • diarrhea
  • itching
  • blood clots and other side effects

It was also medically proved that vitamin B12 is safe when it is used to treat psoriasis on the skin. During medical tests one person who was taking B12 cream together with specific avocado oil to treat psoriasis reported mild itching.

Special warnings and precautions

  1. Breast-feeding and pregnancy – in most cases Vitamin B12 is safe for breast-feeding and pregnant women if it is taken orally and under supervision of the doctor. For pregnant women the recommended dose is 2.6 mcg daily; for breast-feeding women the dose should not exceed 2.8 mcg a day. It is very important to consult your doctor before taking vitamin B12. Do not take larger dose than you were instructed by your doctor. There is no evident if the larger doses are safety for breast-feeding and pregnant women.
  2. High numbers of red blood cells (polycythemia vera) – the treatment of vitamin B12 deficiency can unmask the symptoms of polycythemia vera.
  3. Abnormal red blood cells (megaloblastic anemia) – sometimes vitamin B12 is prescribed to correct the megaloblastic anemia. But please be aware that it may lead to serious side effects. Do not start vitamin B12 therapy without first consulting your healthcare provider.
  4. Leber’s disease, a hereditary eye disease – it is recommended not to take vitamin B12 if you suffer from this disease. Treatment with B12 may lead to serious harm of the optic nerve. In its turn it may lead to blindness.
  5. Sensitivity or allergy to cobalamin or cobalt – you should not use vitamin B12 if you have this condition.

Please note: If any of the conditions listed above may be applied to you, you still have to consult your healthcare provider in terms of using vitamin B12. Every person is different, that is why any treatment should be prescribed by your doctor.

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