There are at least a handful!
One of those even has papers filed with the US Supreme court that should be possible to use somehow, in short a guy that cured thousands with a plant diet was asked to provide independent MD assesments before and after the treatment proving it was not a scam.
He did so with hundreds of patients, and was cleared. He is dead now, can't remember the name off the cuff, but the clinic he set up in Costa Rica is still there.
Then of course we have the amygdalin case that somehow got the label of vitamin B17, this looks to me to be very plausible and safe, G. Edward Griffin both wrote a book & produced a film that is available on Bitchute.
There is also the Hoxley clinics that were all over the US before WW2, with good results in many cases.
Furthermore many of these protocols can be combined, certainly with cutting all sugar and getting into intermittent fasting and so on.
One could go on and on and on, but I'd want to get more organized, and of course with the appropriate opsec!
Taking on the mafia that has pushed this whole murderous paradigm on the global population is not for the faint hearted...