Selenium is an essential micronutrient. The average selenium intake in Danish adults is close to the recommended level of 40-50 μ g/day. There is no scientific documentation showing that an increased selenium intake will result in disease prevention. However, a preventive effect on some cancers and hearth disease cannot be ruled out. Fortification of foods via increased selenium content in fertilizers is a possible way of increasing selenium intake. The tolerable upper intake level of 60 μ g/day in children 1-3 years old must not be exceeded, which makes fortification difficult.