To supplement selenium intake Selenium is bound to protein fractions in food. It is found in meat, fish (many saltwater fish), eggs, and rye. However, many regionally grown and produced foods often contain only small amounts of selenium, as European soils often have low selenium levels. Uniselen 100 NE contains the trace element selenium in the form of sodium selenite. From this compound, the selenium can be incorporated particularly quickly into selenium-containing enzymes and made available to the body.