New research is dashing hopes that it could reduce the risk of developing some forms of the disease.
Researchers found no link between higher blood levels of vitamin D and lower rates of certain cancers.
Authors of the study analyzed blood samples from more than 12,000 people in 10 different studies.
While scientists say it appears vitamin D has little impact on cancer, they did find that people with high level of the vitamin were more likely to develop pancreatic cancer.
There is more on this research published online in the July issue of the American Journal of Epidemiology.