[zxcmx]

I think this is tricky because as soon as you shut down the obvious stuff (ok, dead babies...) you will quickly arrive at barely or non provable stuff, acai berry level things, and medical claims (fructose intolerance! real thing btw!) which you are going to need a phd to sort out. I am not sure how youtube or any general content site could realistically be expected to have a policy on all these things.

You can't eradicate the nonsense you can just change its nature. In some ways I think having complete nonsense out there is healthy in terms of promoting skepticism amongst normal people.