Read again, I wrote that many, not all were disproven. I also did not dismiss the natural cure industry as a whole. Just the ones peddling bogus claims.
As it has been said, millions upon millions of dollars are made in the nat.suppl industry, so there is more than enough money to fund a study. But it wouldnot be in their best interest to prove claims they are making are false.
You are also falling into the naturalistic fallacy, by assuming that anything that is natural is good. When if fact, they can be even more dangerous than some of the FDA approved drugs that you deride so much.