Vitamin B12 Side Effects

by John Staughton (BASc, BFA) last updated -

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There are some vitamin B12 side effects that you should consider before adding one of these supplements to your daily health regimen.

Vitamin B12 Side Effects

There are many potential side effects of taking vitamin B12, particularly in excessive amounts, including many of the following. If you detect any of these side effects, discontinue use and speak with your doctor about the symptoms you experienced.

  • Headache
  • Restenosis after stent placement
  • High blood pressure
  • Acne
  • Rash
  • Itchy or burning skin
  • Pink or red skin discoloration
  • Facial flushing
  • Urine discoloration
  • Numbness

  • Nausea
  • Difficulty swallowing
  • Diarrhea
  • Increase in blood volume and red blood cells
  • Low potassium levels
  • Flare-ups of gout
  • Complications of pregnancy
  • Allergic reactions
  • Leber’s disease
  • Polycythemia vera
  • Swelling sensation in the body
  • Muscle cramps
  • Irregular heartbeat
  • Unusual weakness
  • Slurred speech
  • Dizziness
  • Difficulty breathing
  • Blood clots
  • Weight gain

Note: Breastfeeding women should speak with a doctor before taking B12 supplements etc.

Vitamin B12

Vitamin B12 is a water-soluble vitamin in the B vitamin complex and is actually used to describe a number of different forms of a compound containing cobalt, known as cobalamins. One of the most common cobalamins that are found in food is known as methylcobalamin. Vitamin B12 is bound to proteins in food and is released into the body upon absorption. However, when you take supplements of vitamin B12 additives, the vitamin is already in an unbound form.

The body requires vitamin B12 for a number of important functions, including the production of blood cells and proper nervous system activity. It is also crucial for DNA synthesis and various other functions in the body. Various health conditions can cause a deficiency in this vitamin, which may lead to supplement use. However, there are some people who should not consume vitamin B12 or must be careful when using these supplements due to potential side effects. Protection Status
About the Author

John Staughton is a traveling writer, editor, and publisher who earned his English and Integrative Biology degrees from the University of Illinois in Champaign, Urbana (USA). He is the co-founder of a literary journal, Sheriff Nottingham, and calls the most beautiful places in the world his office. On a perpetual journey towards the idea of home, he uses words to educate, inspire, uplift and evolve.

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