From what I've read, one should separate oxidizers from anti-oxidants, but no need to eliminate the anti-oxy's. I could be wrong. I think it's a good question - and would like to know what others on this particular forum think also.
I use a basic water ozonator, and feel it's good enough. Paul might say I'm wrong. I know medical grade is better, but much more expensive. The whole nitric oxide thing has been debated as an issue, unless it's injected.
Just thoughts - hardly the expert. I'd love to see someone post a super informative link to a site which (without bias) answers these questions.
Ozoneman (Paul) has great products and is a pleasure to work with. Added benefit is your access to him here - as well as his ability to/strength in helping you via email.
I guarantee you won't regret it. Covers EVERYTHING, but does not get specific in terms of particular or recommended manufacturers. Just LOADED with verifiable info.