Vitamin D lowers chances for breast cancer

In 2002, doctors advised postmenopausal women on hormone replacement therapy (HRT) of an increase in chances for breast cancer. Earlier studies suggested vitamin D might protect against breast cancer, particularly estrogen receptor positive tumors. In this study, 57,403 postmenopausal women completed questionnaires every few years from 1990 to 2008, reporting on diet, vitamin D from supplements and diet, HRT, and other factors.

Overall, women who were currently taking vitamin D supplements were 18 percent less likely to have developed breast cancer compared to women who had used vitamin D in the past or to women who had never used vitamin D at all. Doctors found the greatest benefit among women who had been on HRT and who continued taking vitamin D. Their chances for developing breast cancer were 26 percent lower.

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