Anecdotally, it's reported that Peat said in email: "[What do you think of ubiquinol supplementation? Is it dangerous?] I would prefer to use ubiquinone; the reduced form is more likely to be interactive with iron, etc.:
It's not clear how much ubiquinone is absorbed by the body, unless you dissolve it in DMSO and alcohol (and perhaps urea), and apply it to skin membranes. That may not be practical for you.
There are a number of other quinones you can try that might be more effective and practical, such as the tetracyclines, emodin, lapachol and Vitamin K2.