Selenium is a very interesting metal from a nutritional standpoint. We only need it in tiny amounts, like 200 micrograms (thousandths of a gram) daily. Thyroids need selenium in order to make thyroxine, a life sustaining hormone. Selenium has also been shown in multiple studies to reduce the rates of  most cancers     by about half. That’s a 50 percent reduction! That is why selenium should be in virtually every multivitamin. If it is not in yours,  get a better multi. My recommendation is the Perfect Multi from Purity Products. It is available on my website.
Now comes a  completely new use for selenium. Making soft contact lenses resistant to colonization by pathogenic bacteria. Dr. Mark Willcox, a microbiologist and professor of Optometry and Vision Science at the  University of New South Wales in Sydney Australia has incorporated selenium into an organic compound and bonded it to the lens material. Growth of Staph aureus was decreased by 1000 %. Pseudomonas aeruginosa growth was less. What is so good about this is that there were no deleterious effects on the corneal epithelium. Those of you who have had an infection from contact lens wear know how important this may be. Those of you who have had an infection from contact lens wear know how important this may be.
Knowing how slowly the FDA operates, it may be some time before this is available to the general public.