Through the same scientific processes we use for to verify all medicine and medicinal procedures. You don't establish benefits by selling it to the public.
I was saying this in the context of offering a treatment to the general public. That's very different from a clinical trial, where there are benefits beyond the immediate effects on the patient that help to justify the individual risk. The benefits of scientific studies on medical treatments are well-established.
Even if you think you can find some weird corner case where this doesn't apply, do you disagree with the general principle that benefits should outweigh risks for medical procedures?
