U. WARWICK (UK) — For well-nourished adults, current evidence indicates that selenium supplements don’t help prevent heart disease. The systematic review in The Cochrane Library suggests that taking selenium supplements does not reduce a person’s risk of developing heart disease, although most evidence is currently limited to healthy American adults. Diet is a key factor influencing heart disease risk. Selenium is one dietary element that could potentially play a role in preventing heart disease by protecting against oxidative stress and inflammation.