20 Aug 2019 --- Vitamin D supplementation reduces the risk of cancer death by 16 percent, according to a recent study published in the British Medical Journal (BMJ). However, vitamin D supplementation alone was not associated with preventing all causes of death, only cancer. The findings reveal another win for vitamin D’s function in human health. However, the leading professor on the study, Dr. Fang Fang, warns that the supplement is no silver bullet for longevity.