Vitamin D: Criteria for safety and efficacy

Robert P. Heaney

Research output: Contribution to journalArticlepeer-review

113 Scopus citations


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).

Original languageEnglish (US)
Pages (from-to)S178-S181
JournalNutrition Reviews
Issue numberSUPPL.2
StatePublished - Oct 1 2008

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Nutrition and Dietetics


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