does vitamin b12 injections cause constipation | Energy Boost Vitamin B12: What Are the
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Discuss with your doctor to determine the ideal frequency of follow-up injections

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Across the six published trials, the most common adverse events were headache, mild gastrointestinal effects (diarrhea, flatulence, nausea), nasopharyngitis, fatigue, dizziness, and mild injection-site reactions