If there's an actual natural, identified substance with huge benefits to people, it's going to go gangbusters and you're going to make a lot, LOT of money selling it, even if you're doing it via roadside lemonade stand.
It feels like this claim is usually used to promote cures and treatments with extremely low quality RCTs backing their use as a sort of panacea.
I used to believe the "just do shrooms to cure depression" claims on principle until I looked into the quality of those studies, which is very low. At that point, you're just making stuff up.