Four years of supplemental vitamin D and calcium made no difference in cancer risk.
Researchers divided 2300 postmenopausal, healthy women aged 65 or older, into two groups. One group received 2000 IU/day of vitamin D3 and 1500 mg/day of calcium; the other a placebo. After 4 years, the difference in any new cancer incidence between groups was insignificant--including breast cancer. While more research is needed, this study indicates supplementation later in life may not make significant differences.
PositiveTip: Adequate vitamin D and calcium are essential throughout the life span, but supplementation may not be necessary.