It may be considered by some health professionals that very few people are vitamin B-12 deficient. This assumption may stem from the fact that vitamin B-12 is produced in the body by a normal, healthy population of bowel bacteria; however it is not clear whether this mode of action is sufficient for proper nutrition.
Also, unlike other water-soluble vitamins, a certain amount of B-12 can be stored in the liver, kidneys and other tissues.
Symptoms of B-12 deficiency often appear so slowly and subtly that they may go unnoticed and the symptoms may be wrongly diagnosed, also blood tests for vitamin B-12 levels may miss early deficiency states
http://www.proventus.org.uk/Vitamin%20B%20and%20the%20effects%20of%20deficiency.pdf
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