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Incidentally, the healthy reference range is 191-663 pg/ml and correlates closely with oral cobalamin intake, which is why the vitamin B12 blood level alone is not an adequate parameter to diagnose a deficiency (Herrmann and Obeid, 2014)
The fix: inject a small amount of air (0.3-0.5 mL) into the vial first before drawing water into the syringe
The Food and Nutrition Board has not established a Tolerable Upper Intake Level (UL) for vitamin B12 because of its low toxicity potential
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