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The test then shows extremely high values beyond 1000 pg/ml of B12, although in reality there could well be an extreme vitamin B12 deficiency present (27-29)

What an elevated serum B12 represents, and why no single threshold exists A serum B12 reflects vitamin bound to transport proteins in the blood, not the amount that has reached the tissues, and the threshold for calling it high shifts with the assay, the laboratory, reference interval, and the unit on the report

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How B12 Supports Natural Energy Production Low energy frequently disrupts peoples plans for weight loss