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Vitamin B12 Deficiency Vitamin B12 deficiency happens when the body does not have enough vitamin B12. Vitamin B12 is important for making healthy red blood cells and keeping nerves Vitamin B12 Shot Delaware: Delmarva Pain and Spine Center: Pain Management Physicians Why do I feel worse after a B12 injection: causes explained Feeling tired, sluggish, or run down? Vitamin B12 plays a key role in energy production, metabolism, brain function, and red blood cell formation. B12 injections deliver this essential vitamin directly
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