That's a really tough one. I just watched the lactose intolerance fix video you linked. Certainly that fabrication process is beyond my ability. But, after more of my own research, maybe I'd decide I want to pay someone else to produce the therapy for me. (I'm not anywhere near as lactose intolerant as the guy in the video, but it's bad enough that I'd be happy to rid myself if this problem.)

But should I be able to do that? Am I capable of evaluating the risks? Am I capable of even enumerating the various risk factors? This is not my field at all. Maybe the person making this for me is doing it in an unsafe manner, in a way that could result in dangerous contamination. How would I know?