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I Feel Tired All the Time. Do I Need a B12 Shot?: Shawn Veiseh, M.D.: Family Medicine Why Do I Feel Worse After My B12 Injection? Causes & Management Bolt Pharmacy 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 How Long Does It Take for B12 Shots to Work Fast? Chronic Fatigue: Can B12 Shots Make You Tired? PA Relief
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