I have been using food grade h2o2 for a little over a month (25 drops x 3 times a day). I went to get retested this week and my level has dropped from 4.67 to 1.9. I would like to assume it is working. I plan to keep using it for the next 3 months then I'll get retested again! I heard that the blood takes 90 days to filter so hopefully by then end of that time this will all be over... But, I also feel like I should keep taking it 1 or 2 times a week just to make sure it all stays away!