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If you show a deficiency, your doctor may want to investigate why you are deficient if you are and to gauge how much B12 you might need

K., Simmons, D., Ahlenstiel, G

They are: Energy: B12 helps produce red blood cells, which carry oxygen throughout your body

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Related: Vitamin B: Top 6 Benefits of B Vitamins & How to Get More in Your Diet Precautions/When to See Doctor Supplementing with vitamin B12 may not be right for everyone and can even be contraindicated in some cases due to the potential vitamin B12 side effects