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The most common reason someone would need to have their vitamin B12 levels checked is to evaluate for vitamin B12 deficiency, says Mike Ren, MD, assistant professor of family and community medicine at Baylor College of Medicine

Some use it for short-term recovery, while others may use it longer for ongoing health benefits

Importantly, persistently high serum B12 in the absence of supplementation should prompt GP assessment, as it may indicate underlying disease processes

A new study just published shows that older people have slower processing speed in the brain at B12 levels in the lower half of the reference range