Vitamin B12 plays many important roles in the body, such as keeping your blood cells and nervous system functioning properly
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
Choosing based on your protocol When in doubt, stick with 3 mL
This injection is mostly recommended for patients who are unable to take oral medications, such as before or after surgery

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Enhancing B12 Intake Through Diet In addition to supplements, elderly individuals should be encouraged to consume foods rich in vitamin B12