This is a fact: No country in the world is more dependent on synthesized drugs than the United States. Big Pharma is a $300+ billion dollar industry in the U.S. alone, and as Big Pharma makes no money on organic remedies… well, it isn’t hard to figure out what their lobbyists are doing.
As a result, most studies are conducted internationally.
The U.S. is, however, beginning to conduct early-stage studies – of course restricted by the iron fist of the FDA. (Think FAA x 1,000)