Nutritional supplements are often tried to prevent cancer. But well- designed rigorously conducted clinical trials have NOT shown any benefit in prevention of many cancers.
Selenium was suggested as a preventative supplement for skin cancer.
A clinical trial compared Selenium against placebo in United States. The results were disappointing.
Selenium supplementation was found to be ineffective at preventing Skin cancers.
To make matters worse, Selenium was found to Harmful and increased the the risk of getting some skin cancers such as squamous cell carcinoma.
Selenium Supplementation and Secondary Prevention of Nonmelanoma Skin Cancer in a Randomized Trial. Anna J. Duffield-Lillico, Elizabeth H. Slate, Mary E. Reid, Bruce W. Turnbull, Patricia A. Wilkins, Gerald F. Combs, Jr., H. Kim Park, Earl G. Gross, Gloria F. Graham, M. Suzanne Stratton… Show moreJNCI: Journal of the National Cancer Institute, Volume 95, Issue 19, 1 October 2003, Pages 1477–1481, https://doi.org/10.1093/jnci/djg061
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