Here is my experience so far using hydrogen peroxide:
I started a month ago, trying out the baths, the inhalation method, and also the food grade drops internally. For anyone who is worried that the h2o2 bath is less useful since it's used externally, don't worry about that. The baths work just as effectively. In fact, I've had to taper off the number of bottles (32oz at 3%) I use per bath, from 4/day to just one, because my detox symptoms started to become pretty bad. I've done a lot of metal detoxes, and I recognize from those the same anxiety and flu-like symptoms when my body can't clear out the toxins fast enough.
Anyway, for me drinking the drops in water led to a lot of nausea which was a deal breaker, so I stopped. The throat spray seems to have been incredibly powerful, but I stopped doing that as well since it irritated the back of my throat. The good news is, if you have those problems, you can easily get the same results from the baths alone. And they make my skin look excellent as well.
What I want to mention though is this: it is possible to overdo it! Someone else on this site wrote about a "hang over" effect from the h2o2, and I think that must be what I've had? I believe that the h2o2 is building up over time, and that it needs enough space between doses to clear itself out? Has anyone else had a similar experience, finding the upper limit on the dose they can handle? And what happens after that?
Overall, it seems that my muscles and joints are less rigid than before I started. I'm taking the h2o2 for persistent low level arthritis and fibromyalgia. Thanks so much earthclinic for providing such valuable information!