Those professors can do that as well if only they were serious enough to test ozone therapy. That makes ozone an oxygenator. Of course, ozone alone does not cure anything. This is one of the explanations of the paradox of oxidant ozone serving as antioxidant therapy. By improving tissue oxygenation, ozone diminishes oxidosis.
Ozone tightens arteries.
Ozone opens up arteries. That makes ozone a vasoconstrictor. Ozone commonly creates a flush effect if given rapidly. That indicates opening up of blood vessels, and not tightening them up. That makes ozone a vasodilator.