You want proof?
How about we start with this:
Oz many times acknowledged products he told viewers to use are not scientifically supported and don't have the research to be presented as fact.
He has more or less publicly admitted that he hawks stuff which there is insufficient evidence for.
He's a paid shill, with little medical credibility, because he advocates which he is paid to advocate.
Which means he has now stayed into being entertainment, but not fact or medicine. But he sure as hell isn't acting as a credible medical professional.