I went to a contact reflex analysis person who tested me for the silver from Natures Sunshine. It tested bad for me. I had been taking the iodine, so I asked her to test that on me and it tested well for me. If you don't feel the silver is working, then you may want to try the iodine. I also tested very well for SeMC selenium, and magnesium taurate which are recommended in the Iodine forum to take along with the iodine.