The extra oxygen molecule in H2O2 will leave the H2O bond and bind to other molecules- this creates oxidation in the body by which damages those molecules. Kinda like adding too much water to hot cocoa…ruining the taste.
Pure O2 to breathe is actually poisonous for long term for that very reason. https://www.sciencefocus.com/the-human-body/why-does-breathing-pure-oxygen-kill-you/
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