High doses of vitamin D do not cut cancer risk

A new clinical trial conducted at Brigham and Women's Hospital and Harvard Medical School indicate that high doses of vitamin D supplements may not lower risk of developing cancer in older women.  According to Dr. JoAnn Manson, the trial, involving 2,300 older women randomly assigned either high-doses of vitamin D plus calcium or placebo pills resulted in "no compelling evidence that vitamin D reduces cancer incidence."  Two additional trials, comprising 20,000 individuals are currently ongoing.

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