There are powers within the United States that require all forms of medicine including natural medicine to go through the same extensive costly research that drugs go through before the manufacturers can make claims. This expense can cost up to 5 million dollars and many years of research. The drug companies are allowed to patent the drugs that they bring to market, but the natural medicine companies cannot. Without being allowed to patent their products it does not make sense to spend all the money and time to prove that their products work.
Lets take for example PC SPES .
This product is used for prostate cancer with amazing success. But until now the public could not be told this. The company that invented PC SPES spent 7 years and millions of dollars and was fortunate enough to be picked up by U.S. News and many other major medias. You will shortly find them listed in the New England Journal of Medicine. In the meanwhile 2 million men had to die from prostate cancer because of the powerful agencies in the United States that didn't allow this company and many others to talk about their products.