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The study involved 1,179 healthy women from rural Nebraska. One group of women was given calcium (around 1500 mg daily) and vitamin D (1100 IU daily) while another group was given placebo.
Over four year, the group receiving the calcium and vitamin D supplements showed a 60 percent decrease in cancers.
Considering just the last three years of the study reveals an impressive 77 percent reduction in cancer due to supplementation. (The full press release of this study is included below. It provides more details about the findings.)