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Why do I feel worse after a B12 injection: causes explained Signs and Symptoms of Vitamin B12 Deficiency does b12 injection cause headache Vitamin B12 deficiency can cause symptoms like headaches, fatigue, depressive mood, gastrointestinal issues, and 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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