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86), plasma lactate (Ref

Symptoms usually develop gradually

N Engl J Med 319:223226

But probably most important is appropriate and full dosing we dont skimp on nutrients

The iron-rich milieu induces upregulation of the iron transporter DMT1 through two sequential mechanisms: First, unbound iron activates hypoxia-inducible factor-1 (HIF-1), which directly binds to the DMT1 promoter to enhance its transcription (Ingrassia et al

Therefore, it does not necessarily imply that higher levels of serum vitamin B12 is due to a higher intake
