Selenium is an essential mineral that may support the immune system, fertility, and cognitive function. It exists mostly in the skeletal muscles. Learn more.

Selenium deficiency refers to not having enough selenium in your system. Symptoms may include fatigue, muscle weakness, and infertility, among others.

Keep reading to learn more about selenium and why we need it, as well as 15 foods that contain this important nutrient.

You need only trace amounts of selenium to survive. Falling outside of this narrow therapeutic window can have significant health consequences.

Selenium is a trace mineral essential for thyroid and immune health. Learn the benefits, food sources, deficiency, recommended intake, and risks of too much selenium.

Selenium – a mineral found in many foods – could reverse the cognitive impact of stroke and boost learning and memory in aging brains, according to University of Queensland research.

Taking high doses of selenium or vitamin E can increase the risk of prostate cancer, a new study found. Vitamin E supplements can raise the risk of prostate cancer by as much as 63 percent in certain ...