I have had some bad breath and chronic fatigue for quite a few years. I was just trying everything I could think of . The doctors were of no use. I used a cap full of drug store hydrogen peroxide to brush my tongue. I was pleasantly surprised to find my chronic fatigue was greatly reduced in just days. I have only been using it for about three weeks. I recently got some food grade which I reduced to 3%. I am going to start taking it by spray since I have asthma. The asthma seems a bit better just from the little bit I have used to brush my tongue. Oh yeah, the first night It was hard to go to sleep. I didn't know that this is a common effect.