The American journal of clinical nutrition
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Randomized Controlled Trial Multicenter Study
Estimation of the dietary requirement for vitamin D in healthy adults.
Knowledge gaps have contributed to considerable variation among international dietary recommendations for vitamin D. ⋯ The range of vitamin D intakes required to ensure maintenance of wintertime vitamin D status [as defined by incremental cutoffs of serum 25(OH)D] in the vast majority (>97.5%) of 20-40-y-old adults, considering a variety of sun exposure preferences, is between 7.2 and 41.1 microg/d.