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Allergic reactions Allergy to vitamin B12 is quite uncommon, but some people might experience allergic symptoms, especially when they first start supplementing
Oral supplements are easy but require discipline
Vitamin B12 Deficiency: Corrects deficiencies caused by dietary restrictions, medical conditions, or absorption issues
Possible side effects include: Pain or redness at the injection site Mild nausea Headache Dizziness Skin rash Allergic reactions (rare) Seek immediate medical attention if you experience swelling, difficulty breathing, or other signs of a severe allergic reaction