The effect of vitamin D supplementation on the risk of breast cancer: a trial sequential meta-analysis

Observational studies suggest an inverse association between circulating vitamin D levels and risk of breast cancer. However, the potential benefits of vitamin D supplementation to reduce the risk of breast cancer remain controversial, based on the results of current randomized controlled trials (RCTs). The aim of this study was to evaluate the value of vitamin D supplementation on breast cancer prevention. PubMed, Embase, and Cochrane library...