How can vitamin D increase life expectancy of people with cancer?

Taking vitamin D for three or more years can help prolong the life of cancer patients, Cancer Prevention, Hereditary Genetics, and Epidemiology reported referring to a study.

Scientists at Hurley Medical Center and the University of Michigan analyzed disease prevention data from over 79,000 patients that randomly compared vitamin D supplements with placebo for at least three years.

Based on the results, they determined that vitamin D supplementation was associated with a significant reduction in cancer mortality.

The difference in mortality between the vitamin D and placebo groups was statistically significant to be significant among the cancer patient population. However, researchers note that the required dosage of vitamin D in the blood is still unknown. They also said that it is unclear how this vitamin can prolong life.