B12 Allergy

Allergies to vitamins are not common and they rarely occur. In some cases, a person can be allergic not only to vitamin B12, but to all vitamins. Vitamin B12, a water based vitamin is commonly found in dairy products, fish and shellfish and is very essential for proper body functioning. Let us know about B12 allergy in detail in the article below.

How does B12 Allergy Occur?

Usually, the body shows allergic reaction to a certain substance when the immune system is hypersensitive to that particular substance. This substance is referred to as allergen. Here B12 vitamin is the allergen. The body system mistakes B12 vitamin as a harmful substance and tries to ward it away by producing antibodies. The antibodies therefore enable histamine production to fight off this vitamin. The increased histamine in the body can therefore cause allergic reactions.

Symptoms of B12 Allergy

The common symptoms developed as a result of B12 allergy include:

  • Shortness of breath
  • Hives
  • Swollen lips, throat and tongue
  • Skin reactions that lead to itchy and inflamed skin
  • Coughing, wheezing, chest pain and breathing difficulty, all of these as a result of shortness of breath

Severe allergic reaction to B12 vitamin causes anaphylactic shock. This is an extreme allergic response where in the whole body experiences a rise in histamine levels. This causes an increased heart rate, swelling in the throat, sudden drop in blood pressure levels, dizziness and fainting. Epinephrine injections can help the patient to come out of anaphylactic shock.

Some other rare symptoms of B12 allergy include:

  • Fever
  • Joint pains
  • Nausea
  • Pain
  • Numbness
  • Stomach upset
  • Diarrhea
  • Itching

This is a brief description on B12 allergy. If you are diagnosed with this allergy, you need to be extra careful in consuming foods containing vitamin B12, cobalmin and cobalt.

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