I didn't know C could mess with the kidneys. I'm having a horrible time seems with my kidneys the past couple weeks. Wonder if this could have anything to do with it. I follow Dr. B's program but do take a lot of C to help with detox. I've been on 100 mg Iodine for awhile, but really struggling and having a horrible time with my thyroid still no matter what I've tried. I've never heard C causing problems with the kidneys.