While vitamin B12 injections are predominantly safe, some individuals might experience side effects such as: Mild diarrhea Itching, rash, or redness at the injection site Headache, dizziness, nausea, or vomiting Swelling sensation, cough, or shortness of breath Chest tightness, rapid heartbeat, or blood clots (rare) Severe side effects, although infrequent, require immediate medical attention
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This matters for people whose bodies struggle to absorb B12 through food, since an injection skips the digestive absorption step that oral supplements depend on
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