Vitamins, Nutrition & Supplements
Published on 10 September 2026
B12 injection side effects
Most people tolerate B12 injections well, but some feel mild pain, redness, or swelling right at the injection spot. A few people experience headache, nausea, dizziness, or loose motions afterward. Allergic reactions like rash or itching happen rarely, and serious reactions are even rarer. If you notice trouble breathing, swelling on your face, or severe dizziness after the injection, go to a doctor immediately without delay.
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