This is exactly the concept I was referring to: under medical control, high oxygen pressure is a great and powerful tool, exactly as a drug.
Well, not exactly: this is about the theory of aging, ROS, "eliminating all free radicals", etc. Of course none of those studies have anything about how much and for how long to do it to get the apparent antioxidant boost... or how much is too much. FWIW I haven't even bothered getting a nitrox cert, myself: I'll pay for it if and when I feel like I need it, but so far I have not felt that way.