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Measurements of serum vitamin B 12 may not reliably detect deficiency, and measurement of serum homocysteine and/or methylmalonic acid should be used to confirm deficiency in asymptomatic high-risk patients with low normal levels of vitamin B 12

It is commonly found in foods such as food, meat and dairy products which can be a perfect source

Another study highlighted the metabolomic changes associated with vitamin B12 deficiency and repletion, showing improvements in markers of mitochondrial function, myelin integrity, and peripheral nerve function after vitamin B12 injections

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