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Best B12 Shots in Chicago & Naperville 2026 Why do I feel worse after a B12 injection: causes explained I Feel Tired All the Time. Do I Need a B12 Shot?: Shawn Veiseh, M.D.: Family Medicine For a patient with confirmed vitamin B12 deficiency who has health anxiety and prefers injections, should we give mecobalamin (methylcobalamin) or cyanocobalamin injections, or use oral cyanocobalamin instead?
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