My son's first blood work was done when he was 3 and it came back with iron deficency and high B12, so doc. suggested iron suppliment and no multivitamins. At age 4 the blood work shows iron in good but low hemoglobin 106 g/l. B12 is still high 1206 pmo1/L. All other things are normal. We will see a specialist in couple of weeks. I am really concerned about B12.
Excess amounts of Vitamin B12 from food or supplements have not been associated with adverse effects. A Tolerable Upper Intake Level has not been determined due to the low toxicity of the vitamin. Thank you for your question.
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