Intrinsic factor deficiency causes pernicious anemia, which may be associated with subacute combined degeneration of the spinal cord
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The bigger barrel pulls the full water volume in one draw, requiring only one piercing of the vial to keep contamination risk low
The speed of response depends on factors including the severity and duration of deficiency, the presence of neurological complications, and individual metabolic differences
When to Seek Medical Advice About B12 and Sleep Issues Whilst vitamin B12 supplementation rarely causes sleep disturbances, certain situations warrant medical evaluation