Comment by jryb

If we're thinking about the same youtuber, I found that experimental design to be really poor. They said they were lactose intolerant as a child, but they didn't confirm that they still were (decades?) later. I was lactose intolerant until I was six and then it just resolved on its own (perhaps this wasn't even lactose intolerance but a reaction to something associated with lactose).

What they should have done was eat a pizza before the treatment, gotten sick, then taken the treatment and shown that the same pizza had no effect afterwards.