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  1. Vitamin B12 Deficiency: Symptoms, Causes & Treatment - Cleveland Clinic

  2. Treatment of vitamin B12 and folate deficiencies - UpToDate

  3. Vitamin B12 Deficiency: Recognition and Management - AAFP

  4. Vitamin B-12 - Mayo Clinic

  5. Vitamin B12 Deficiency: Causes, Symptoms, and Treatment - WebMD

  6. Vitamin B12 Deficiency: Symptoms, Treatment and More

  7. Vitamin deficiency anemia - Diagnosis & treatment - Mayo Clinic

  8. Vitamin B12 Deficiency - Vitamin B12 Deficiency - The Merck …

  9. Vitamin B12–Deficiency Anemia - NHLBI, NIH

  10. B12 Deficiency: Symptoms, Causes, Treatment - Healthline