Increasing evidence points to the role of vitamin D (VD) supplementation in cancer management. A comprehensive search of online databases was undertaken for all research studies relating to VD supplementation in cancer survivorship published up to November 2017. Eighteen studies meeting the inclusion criteria were selected for this review, the majority of which involved supplementation in breast cancer. This review concludes that VD supplementation plays an important role in disease free survival (DFS) in a number of cancers, particularly breast. In other cancers, the role of VD supplementation is less clear, and more research is required. More research is also required to investigate the most effective dose and duration of VD supplementation to benefit cancer survivors.
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