H202 use for candida

This is my first post here I just found this forum and have been looking into using H202 35% for systemic candida. I have a bottle of 12% which has been in the refrigerator the last 2 years, but haven't used it except once. So, I have a few questions. First, has anyone had success treating candida with H202? Can I use the 12% food grade and would it be effective after 2 years refrigerated? Also, as I have been looking on different sites, one mentioned antioxidants should be taken to prevent cellular damage when using oxygen supplements. Is H202 considered the same as oxygen supplements and are antioxidants recommended? Thanks for your help.