Vitamins, Nutrition and Supplements
Published on 2 November 2026
Answered & medically reviewed by
Dr. Shruti Meel✓ Doctor verified
MD in Radiodiagnosis • 1 year experience
What are the side effects of B12 injection?
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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You can get vitamin B12 mainly from animal-based foods like meat, fish, eggs, milk, and cheese. Vegetarians can rely on dairy and eggs, while vegans often need fortified foods or s...Read More
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