It would be a decent design to put a little ozone in to a house or something, but not for therapy.  First it would be hard to administer.  And even if you could there is really no idea of the output, which is critical.  High concentrations (which is actually very small concentrations in this case) can damage the tissues and hemolyze the red blood cells.  When using ozone for treatments internally the concentration is less than 1% ozone.