Vitamin D and Calcium: Numerous observational studies have found supplemental calcium and vitamin-D to be associated with reduced risk of common cancers. However, interventional studies to test this effect are lacking.
A randomized, placebo controlled, clinical study was conducted in 2007 on 1180 women to determine the efficacy of calcium alone and calcium plus vitamin-D in reducing incident cancer rist of all types. The outcome of the study indicated that improving calcium and vitamin D nutritional status substantially reduces all-cancer risk in postmenopausal women.
This trial was registered at clinicaltrials.gov as NCT00352170. The study was published in The American Journal of Clinical Nutrition.
The link to the trial: