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[1] Don't purchase over-the-counter B12 supplements without medical guidance, as this can interfere with accurate assessment and may mask underlying conditions
If you have a vitamin B12 deficiency, you may receive injections daily or every other day to help replenish your B12 levels
Seek emergency help for trouble breathing, facial or throat swelling, severe rash, chest tightness, or fainting after an injection
Most people tolerate them well, experiencing only mild side effects such as temporary soreness at the injection site or mild headaches
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