| http://www.w3.org/ns/prov#value | - While serum vitamin B12 levels may still be normal for several more years, the body, especially the central nervous system, may be deficient at the cellular level. 83% of the people in our study with metabolic vitamin B12 deficiency had normal levels of serum vitamin B12. ??????Healthy vegans with a healthy bowel flora should produce B12 in their small intestine.
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