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Common side effects may include: Mild injection-site reactions (redness, soreness, itching) Upset stomach or nausea Headache Mild anxiety or restlessness Rarely, allergic reactions If you experience difficulty breathing, severe dizziness, or hives, seek medical attention immediately
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Vitamin B12 plays essential roles in red blood cell formation, neurological function, and DNA synthesis
it can only get it from food or supplements
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