A Radical Point of View: Journey of a Free Radical in a Struggle Against Enzymes and the Body

Your remains, now H2O2 and O2, somehow missed the catalase, but were readily bonded to one of multiple different glutathione enzymes. These proteins, such as glutathione reductase, peroxidase, and S-transferase use 4 selenium cofactors to catalyze the decomposition of hydrogen peroxide into water and O2. Similar to catalase, these enzymes are abundant in the liver.
End Of Story