Vitamin D helps keep your bones and overall health in good shape, but research does not show that taking vitamin D supplements can prevent or treat prostate cancer. Some people think low vitamin D increases cancer risk, but there is not much solid proof. Testing your vitamin D levels can be useful if you have bone loss, have had falls or fractures, or are on hormone therapy. The right dose depends on your health, kidney function, medications, and other factors. Taking high doses of vitamin D without medical advice can cause problems like high calcium levels or kidney stones.
Infographic: Vitamin D, hype versus evidence: important for bones but not proven for prostate cancer.