Don't forget that many probiotic bacterias naturally produce a small amount of hydrogen peroxide, which add up since they are so many.
Pure hydrogen peroxide doesn't seem safe enough. Sure it will knock out candida, but it will knock out a lot of thing, because its method of action is by causing a lot of oxydative stress (caused by free oxygen O-) which will also work against your intestinal cells.
A small amount on a wound sterilizes and "might" speeds up the healing process, too much/too often impairs the healing process.