High selenium intake and increased risk of skin cancer

Selenium is a trace mineral and acts as an antioxidant in the body protecting against cancer and heart disease.
It is found in brazil nuts, most red meats, chicken, shellfish, and dark mushrooms. Earlier studies reported that taking a selenium supplement for 4.5 years reduced the risk of several types of cancers, but not skin cancers. A recent study suggests that selenium supplements may in fact increase the risk of skin cancer. About 1300 patients with a skin cancer already removed were given 200 micrograms of selenium for 4.5 years and then followed up for 12 years. There was a statistically significant 25% increase in squamous cell skin cancers in those taking supplements. This study was published in the Journal of the National Cancer Institute, October 2003.

Last Updated: December 2003