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If the deficiency is left untreated, the following symptoms can develop and worsen with time: A chronic deficiency can also lead to long-term mood changes

One-size-fits-all dosing is the most common mistake

Others are unlicensed compounds sold on the grey market - and the gap between those two categories is significant in terms of safety, legality, and effectiveness

Author Affiliations Abstract Metformin and proton pump inhibitors (PPIs) have been postulated to have an association with vitamin B12 deficiency

If treatment is not initiated within six months after the onset of symptoms, low Vitamin B12 levels may become permanent