Good old vitamin D stops cancer!: "A large daily dose of vitamin D can lower the risk of developing common cancers by as much as 50%, scientists said yesterday. Researchers found the natural form of the vitamin, known as D3, can reduce the chances of developing breast, ovarian and colon cancer, as well as others. Taking 1000 international units (0.025mg) of the vitamin each day could halve an individual's cancer risk, they said. Vitamin D is normally produced in the skin by the action of sunlight but is also obtained from certain foods. Dietary sources are limited, however. A glass of milk, for instance, contains only 100 IU of the vitamin. The team of US researchers carried out a systematic review of 63 studies, looking at the relationship between blood levels of vitamin D and cancer risk. The papers, published worldwide between 1966 and 2004, included 30 investigations of colon cancer, 13 of breast cancer, 26 of prostate cancer and seven of ovarian cancer. Their analysis, published in the American Journal of Public Health, showed that, for at least some cancers, the vitamin D factor could not be ignored... However, the team warned taking high doses of vitamin D - more than 2000 IU a day (0.05mg) - could cause serious damage to the liver and kidneys. Excess Vitamin D is stored in the liver, where it can promote dangerously high levels of calcium uptake.""