Common reactions may include pain, redness, or irritation at the injection site, mild diarrhea, nausea, itching, headache, dizziness, or a general feeling of swelling
Some patients might also experience headaches, lightheadedness, or stomach upset, such as mild nausea [2]
Do not freeze the liquid solution
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B12 is water-soluble, meaning any excess is excreted by the body rather than accumulating to toxic levels
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