Selenium is a micronutrient most commonly found in fish, meat, and eggs. It is important for the maintenance of a healthy immune system and thyroid production. Consuming too little selenium can lead to a deficiency, which can cause health problems. In industrialised countries it is rare for a person to have a selenium deficiency. Nevertheless, Selenium is readily available as a dietary supplement and it is often taken for cancer prevention or against cardiovascular diseases.
The following fact boxes will help you to compare the benefits and harms of selenium intake for cancer and cardiovascular diseases. The numbers presented in the fact boxes are based on summaries of the best available scientific evidence.