European journal of clinical nutrition
-
Randomized Controlled Trial
The impact of 1-year vitamin D supplementation on vitamin D status in athletes: a dose-response study.
To assess the prevalence of vitamin D deficiency in Dutch athletes and to define the required dosage of vitamin D3 supplementation to prevent vitamin D deficiency over the course of a year. ⋯ Vitamin D deficiency is highly prevalent in athletes. Athletes with a deficient or an insufficient 25(OH)D concentration can achieve a sufficient 25(OH)D concentration within 3 months by taking 2200 IU/day.