Association between plasma 25-hydroxyvitamin D and breast cancer risk.
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Link to full study
http://www.ncbi.nlm.nih.gov/pubmed/19470790
Conclusion of this study
In summary, these results add to a growing body of evidence that adequate vitamin D stores may prevent breast cancer development. Whereas circulating 25-OHD levels of >32 ng/mL are associated with normal bone mineral metabolism, our data suggest that the optimal level for breast cancer prevention is >or=40 ng/mL. Well-designed clinical trials are urgently needed to determine whether vitamin D supplementation is effective for breast cancer chemoprevention.
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