Sorry, this is totally off track......meant to be funny.
There is a lady in our school district that rinses her mouth with hydrogen peroxide for teeth whitening......her teeth are so friggin white....they are like glowing.....She claims this home remedy as her secret to her unbelievably white teeth.
So if peroxide is frowned upon because it kills tissue.......this lady is screwed....lol
I think it's specifically for wound care.
https://www.webmd.com/first-aid/ss/slideshow-wound-care-dos-and-donts
Using hydrogen peroxide or rubbing alcohol to clean an injury can actually harm the tissue and delay healing. The best way to clean a minor wound is with cool running water and mild soap. Rinse the wound for at least five minutes to remove dirt, debris, and bacteria. Wounds that are large, deep, or bleeding nonstop should be treated by a professional.
(Obviously that last part may not be possible in the backcountry.)