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  1. Vitamin B-12 - Mayo Clinic

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

  3. Vitamin B12 Deficiency: Recognition and Management - AAFP

  4. Vitamin B12 (Cobalamin) - StatPearls - NCBI Bookshelf

  5. VITAMIN B12 - Uses, Side Effects, and More - WebMD

  6. Vitamin B12 - Health Professional Fact Sheet

  7. Vitamin B12 Deficiency - StatPearls - NCBI Bookshelf

  8. Health Benefits of Vitamin B12, Based on Science

  9. Vitamin B12: What Are the Health Benefits?

  10. Vitamin B-12: Benefits, foods, deficiency, and supplements