It is known that Vitamin D deficiency is associated with increased risk of breast cancer and decreased survival. A new study quantified the prevalence of Vitamin D deficiency in women with breast cancer. This study, from physicians at Columbia University, found that 74% of women with breast cancer were Vitamin D deficient. They prescribed vitamin D and calcium carbonate for one year but only 15% were able to achieve normal vitamin D levels. Optimal dosing for bone health is still unknown This study was supported by the National Cancer Institute and published in the Journal of Clinical Oncology.
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