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Description
Published evidence indicates that B12 deficiency can make HbA1c unreliable, but the direction of the distortion whether the result is spuriously high or spuriously low is variable and may depend on the degree of anaemia, the specific HbA1c assay used, and other concurrent conditions

The potential of endogenous neurogenesis for brain repair and regeneration following traumatic brain injury

Exercise provides a familiar example

Some runners prefer alternating between the affected Achilles area and abdominal subcutaneous injection

But some people are not able to meet these levels with their diet and hence require B12 injections
Biochem Biophys Res Commun