This isn't law. This isn't a scientific journal or theory of medicine. It is commentary on the internet. If there is an unsubstantiated claim you have two good faith choices:
1. Ignore it.
2. If, and only if, you are actually interested in exploring the comment deeper than ask a proper question kindly probing for specificity or help with understanding.
There is some false notion that assertions must be proven. It is commentary on the internet. If you really REALLY want it proven, in the spirit of science, you will independently attempt to reproduce the experiment or research.
1. Ignore it.
2. If, and only if, you are actually interested in exploring the comment deeper than ask a proper question kindly probing for specificity or help with understanding.
There is some false notion that assertions must be proven. It is commentary on the internet. If you really REALLY want it proven, in the spirit of science, you will independently attempt to reproduce the experiment or research.