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Vitamin D (ergocalciferol-D2, cholecalciferol-D3, alfacalcidol) is a fat-soluble vitamin that helps your body absorb calcium and phosphorus. Having the right amount of vitamin D, calcium, and phosphorus is important for building and keeping strong bones.
But kids who got 2,000 IU/day vitamin D3 saw their vitamin D levels soar -- to 38 ng/mL for girls and to 35 ng/mL for boys. None of the kids showed signs of vitamin D toxicity. Supplementation of children and adolescents with 2,000 IU a day of vitamin D3 is well tolerated and safe, El-Hajj Fuleihan says.