And here’s another study that refutes the claim that vitamin C supplementation doesn’t affect your health. Researchers at Sweden’s Karolinska Institute found the results of a meta-analysis of studies found improved survival among women with breast cancer who had a higher intake of vitamin C from supplements or food sources. The findings were reported online on March 7, 2014 in the European Journal of Cancer.

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For their analysis researchers selected nine reports describing ten observational studies that included a total of 17,696 women diagnosed with breast cancer, among whom there were 1,558 deaths attributable to the disease and 2,791 total deaths. Studies examined the effect of supplementing with vitamin C following breast cancer diagnosis and/or the effect of vitamin C obtained in the diet.

When the studies that reported the effects of vitamin C supplements were evaluated, their use was associated with a 19% lower risk of death and a 15% lower risk of dying from breast cancer in comparison with no use. Analysis of vitamin C from food sources uncovered a 27% lower risk of death and a 22% lower risk of breast cancer death in association with each 100 milligram per day increase. Comparison of high versus low dietary intake resulted in a 20% lower risk of dying and a 23% reduction in the risk of breast cancer mortality among women whose intake was categorized as high.

“To our knowledge this is the first meta-analysis to combine the limited number of published studies available on vitamin C supplement intake and dietary vitamin C intake and survival following breast cancer diagnosis,” the authors announce. “More studies of post-diagnosis supplement use, including vitamin C, are warranted to further our understanding of how their intake during chemotherapy or radiation therapy may influence breast cancer outcomes.”

Vitamin C and survival among women with breast cancer: A Meta-analysis

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