Additionally, once selenium is oxidized into a water-soluble state many other types of plants absorb it. Through use in irrigation, water run-off, and ephemeral streams the soil has become very seleniferous to the point of toxicity in some places. This, in turn has effected other local vegetation. Selenium effects fauna as well as flora. In the 1950s it was realized that selenium was an essential trace elements in human and animal nutrition.
Humans utilize both organic and inorganic selenium compounds.
In 1995 scientists confirmed that as a mineral antioxidant, selenium protects cell tissue from injury caused by oxygen. It plays as active role in immune system and minimizes damage from viral infections. It is also important for growth and to insure proper metabolism. In males, it improves sperm production. As a micronutrient, not much selenium is needed to maintain good health.