The American Journal of Clinical Nutrition published the results of a study that investigated if high doses of vitamin D combined with calcium can reduce the risk of cancer. The study lasted 4 years and included 1180 women of 55 years and older, which were divided into three distinct groups. One group received 1500 grams of calcium daily. The second group received the calcium plus 1100IE of vitamin D daily and the third group got a placebo.
During the four years of the study 50 people got stricken by cancer (not skin cancer). The risk for getting cancer was 60% reduced in the group that received the calcium and vitamin D supplementation. If only the cancer cases that were discovered after the first year of the study are counted (to rule out cancer that was already present but not diagnosed) the risk reduction was even greater. In the calcium only group the risk of cancer was smaller than the placebo group but greater than the risk in the calcium and vitamin D group.
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