Selenium is an antioxidant that protects cell membranes and prevents free radical generation and can decrease risk of breast, colon, lung and prostate cancer and heart disease, preserve tissue elasticity, slow aging, and help in the treatment and prevention of dandruff. Nutri-Cology Selenium Solution, Hypoallergenic. Dietary supplement. This nutrient is of the purest and highest quality obtainable. Appropriate for food-sensitive individuals. Contains sodium selenite, the form of selenium most often cited in medical studies and clinical protocols, and one of the purest forms of selenium available. The sodium content is nutritionally negligible.