You will also find out how to spot signs of B12 deficiency in nerves and ways to protect your health
Many nutrients have their action INSIDE the cell, which means that testing serum and blood levels just give us an indication of what may be available but that is assuming everything else is working properly: cellular activity, enzyme activity, receptor activity, etc
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So if blood levels come back unusually elevated, don't ignore it
One of the criticisms of blood testing for B12 is that it is just that, a reflection of B12 in the blood, not the cell