Snippet from the article:
A new study recently published in the Journal of the National Cancer Institute suggests that taking high doses of selenium and vitamin E supplements may increase the risk of prostate cancer, depending on a man’s selenium levels prior to taking the supplements.
The research team, including first author Dr. Alan Kristal of the Public Health Sciences Division of the Fred Hutchinson Cancer Research Center in Seattle, WA, analyzed 1,739 patients with prostate cancer and 3,117 matched controls from the Selenium and Vitamin E Cancer Prevention Trial (SELECT).
According to the investigators, previous research has suggested that men who already have an adequate intake of selenium would not benefit from supplements of the nutrient.
Studies have shown that large doses of supplements that offer far more than the daily recommended intakes can increase cancer risk.