Pure sodium selenite solution, which is well absorbed and may be suitable for individuals who are sensitive to other forms of selenium.* The selenite is dissolved in pure, deionized water, allowing the dose to be regulated as needed. Selenium (Se) is a trace mineral which functions as a cofactor for the antioxidant enzymes glutathione peroxidase and some forms of thioredoxin reductase.* Primary role is to help protect cells from oxidative damage, supporting their growth and survival.*