Vitamin D is precursor of the steroid hormone calcitriol and has important functions throughout the body, including increasing intestinal absorption of calcium, magnesium and phosphate. Vitamin D deficiency has been linked with a range of disorders, including several bone diseases. However, large trials of vitamin D supplementation have produced mixed results. Here, experts from around the world discuss several key questions in the vitamin D research and clinical fields.

中文翻译：

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对维生素 D 的看法：多效性因素？

维生素 D 是类固醇激素骨化三醇的前体，在全身具有重要功能，包括增加肠道对钙、镁和磷酸盐的吸收。维生素 D 缺乏与一系列疾病有关，包括几种骨骼疾病。然而，补充维生素 D 的大型试验产生了不同的结果。在这里，来自世界各地的专家讨论了维生素 D 研究和临床领域的几个关键问题。