Calcium or vitamin D supplements do not reduce the risk of invasive breast cancer in postmenopausal women, according to a report in the Journal of the National Cancer Institute.
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A vitamin K1 supplement does not protect against age-related decreasing bone density, but may protect against fractures and cancers in postmenopausal women.
However, Dr. Angela Cheung, the lead author of the study, cautioned that although the clinical trial observations on fractures and cancers are “intriguing”, they are based on small numbers, and that larger studies [...]

Measuring a woman’s bone mineral density can provide additional information that may help more accurately determine a woman’s risk of developing breast cancer. That is the conclusion of a new study published in the September 1, 2008 issue of CANCER, a peer-reviewed journal of the American Cancer Society.