Peroxynitrite is potentially more damaging than the hydroxyl radical due to its greater stability and ability to diffuse to critical cellular locations.

“So the peroxy nitrate now that it's formed, it can it can actually diffuse like through lipid membranes and it and it can just damage so many areas and it can ex it last long enough that it can get to very critical places that other radicals may not get to like the hydroxal radical. It could be argued that peroxin nitrite is even more damaging than hydroxal radical just because peroxin nitrite can go to to to further places whereas the O radical as soon as produced it's like already reacting with something.”