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B12 helps divide the process and the amino acid known as homocysteine, which when levels are elevated can contribute to things such as stroke

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The first-line test is serum vitamin B12 measurement , with levels below 148 pmol/L generally considered deficient, though the exact threshold varies between laboratories

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Warning Signs of Improper Dosing TTaking too little B12 may leave deficiency-related nerve symptoms untreated, while improper use can also lead to unwanted effects or missed diagnoses