Is b12 deficiency life threatening?

Related questions

1. Is 1000 mcg b12 safe?
2. What are the symptoms of high vitamin b12 levels?
3. What is a normal vitamin b12 level for a woman?
4. Does b12 help immune system?
5. What is the best form of vitamin b12?
6. Is b12 really necessary?
7. Is b12 deficiency dangerous?
8. Do bananas have b12?
9. Can I take 1000 mcg of b12 a day?
10. What is a normal b12 level for a woman?

Tags

1. #vitamin
2. #deficiency
3. #inability
4. #persists
5. #severe
6. #neurologic
7. #concentrate
8. #disorientation
9. #memory
10. #irreversible
11. #years
12. #cause
13. #think
14. #damage