Is b12 deficiency serious?

Related questions

1. What is the best form of vitamin b12?
2. What are the symptoms of high vitamin b12 levels?
3. Is a b12 level of 300 normal?
4. Do eggs have b12?
5. Is cyanocobalamin safe to take?
6. Do eggs have vitamin b12?
7. What happens if your vitamin b12 is too high?
8. What is the use of cyanocobalamin?
9. Is 1000 mcg b12 safe?
10. What is Vitamin b12 1000 mcg used for?

Tags

1. #usually
2. #nerve
3. #alone
4. #symptom
5. #damage
6. #common
7. #sensations
8. #needles
9. #deficiency
10. #effects
11. #causes
12. #serious