Yes, but one person repeatedly having a good response to a thing is good evidence that thing is helpful to that person.
While it's good for society to find and recommend things that are beneficial to most people, we shouldn't prevent people from doing the things that they find helpful.
Only after things have been repeatedly tested, and alternative explanations thoroughly ruled out, can a claim be considered accurate. Everything was once alternately laughable or mysterious, until it was thoroughly proven to be true. There is a reason why we aren't letting your blood because you have a cold anymore.