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B12 Injections for Energy and Mood: Benefits 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 I Feel Tired All the Time. Do I Need a B12 Shot?: Shawn Veiseh, M.D.: Family Medicine When Do You Feel Less Tired After B12 Shot? How Long Does It Take to Recover from Vitamin B12 Deficiency?
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