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Endothelial dysfunction, measured as the impaired flow-mediated vasorelaxation of the brachial artery, is a reliable indicator of future cardiovascular disease risk in healthy individuals. To test whether selenium supplementation affects endothelial function, we conducted a randomized, placebo-controlled trial in healthy men who were administered 300 \u03bcg of selenium a day as high-selenium yeast for 48 wk. Brachial artery responsiveness to transient occlusion was assessed at baseline and after 24 and 48 wk of supplementation. The supplementation increased the selenium concentration by more than half in blood plasma and erythrocytes. However, there was no effect of selenium on arterial diameter or blood flow rate before or after transient occlusion or on the maximum dilated diameter after the administration of nitroglycerin. 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