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Possible Side Effects While generally well-tolerated, some individuals may experience mild side effects such as: Pain, redness, or swelling at the injection site Mild diarrhea or stomach upset Allergic reactions like rash, itching, or dizziness in rare cases Headache or flushing due to niacinamide content Any persistent or severe symptoms should be reported to a healthcare professional promptly
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[10] [4] Patients should contact their GP if they experience persistent or severe side effects, signs of allergic reaction (facial swelling, difficulty breathing, severe rash), or if symptoms of B12 deficiency (such as neurological symptoms, severe fatigue, or glossitis) do not improve after several weeks of supplementation
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