The health service added: “Although many of the symptoms improve with treatment, some problems caused by the condition can be irreversible if left untreated.
“The longer the condition is left untreated, the greater the chance of permanent damage.”
Harvard Medical School explains that vitamin B12 deficiency can cause “severe neurological problems and blood diseases.”
Fortunately, there are various means to replenish your levels once the condition worsens.
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