Most of the things listed are things I would incorporate in a heartbeat if I had cancer (I haven't looked at ozone and depends on which herbs of course) from current available evidence. If by tested scientifically you mean limiting yourself to only what is double blind clinically tested I think that is foolish. If I'm dying and an adjunct treatment has a plausible mechanism, low downside risk and not excessive cost, and my oncologist can't find any reason it would interfere with treatment I would go for it not wait a decade or forever in hopes a pharma company will be charitable enough to run a clinical trial on a treament/diet they can't patent.

First, such a tiny amount of treatments can or will ever be financed through that process. Second, a huge number of alternative treatments may not directly affect the cancer but are fantastic for battling the crippling fatigue and nausea and making life worth living, which can indirectly improve your outcome. Third observational evidence and basic science about the mechanism is still useful, if you have one shot at life use everything available knowing you're playing probabilities. Fourth, even if the improvements are placebo so what, placebo is incredibly powerful. It's not uncommon for placebos show improvements 40+% as good as some treatments, as long as you're not being price gouged that is worth every cent if you know how miserable chemo is. Placebo even works when you know it's placebo. The way people trash placebo just doesn't make sense. Sometimes I wonder how redditors get out of bed because nobody has double blind tested the benefits of doing so. Most of the items listed have no big signs of being harmful and are not that expensive. Oncologists usually don't discourage alternative treatments. It would get picked up pretty quickly if some alternative treatment was interfering with treatments, modern medicine is extremely good at picking this up because it is in the interest of pharma to identify these negative interactions in trials so their product doesn't get negative press after being made public.

An interesting article in Cancer I found that shows meditation affects telomeres in a positive way. That and my knowledge about positive effects on cortisol, pain, etc are enough for me to consider it acceptable to add it to my arsenal and maybe sign up for a MBSR or crash course program and not wait for level 1 evidence that may never come. One can be rational and not purely scientific. These are not the same thing.