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Monitoring and Maintaining Optimal B12 Levels Monitoring and maintaining optimal B12 levels requires consistent attention to both medical care and lifestyle choices

Human Molecular Genetics 11 (26): 33613369

The IOM then doubled the amount because only about 50% of dietary B12 is absorbed, and arrived at an estimated average requirement (EAR) of 2.0 g

The results of the B12 test may be one of the following: Normal: B12 levels above 300 pg/mL Borderline: B12 levels between 200 and 300 pg/mL

B12 deficiency can be caused by certain types of anemia, gastrointestinal conditions that affect absorption, or dietary restrictions such as strict vegetarian or vegan diets