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Review
. 2008 Oct;66(10 Suppl 2):S178-81.
doi: 10.1111/j.1753-4887.2008.00102.x.

Vitamin D: Criteria for Safety and Efficacy

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Review

Vitamin D: Criteria for Safety and Efficacy

Robert P Heaney. Nutr Rev. .

Abstract

The functional status indicator for vitamin D, for both safety and efficacy, is serum 25-hydroxyvitamin D concentration. Efficacy for several health endpoints requires levels of 80 nmol/L or higher. Toxicity occurs at levels of 500 nmol/L or higher. The input needed for efficacy, in addition to typical food and cutaneous inputs, will usually be 1000-2000 IU/day of supplemental cholecalciferol. Toxicity is associated only with excessive supplemental intake (usually well above 20,000 IU/day).

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