What does low b12 mean in a blood test?

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  1. #means
  2. #enough
  3. #healthy
  4. #anemia
  5. #doesn
  6. #blood
  7. #short
  8. #these
  9. #tired
  10. #throughout
  11. #cells
  12. #because
  13. #vitamin
  14. #transport
  15. #oxygen
  16. #breath