Vitamin B12: Symptoms, Dosage & Toxicity Risks Do You Need a Vitamin B12 Supplement as You Age? Vitamin B12 Shots Confer No Benefit vs. a Supplement Gene Food Vitamin B12 is essential for energy production, nervous system function, and red blood cell formation. However, oral B12 supplementation doesn't work well for everyoneabsorption can be limited by digestive issues, certain medications,
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