If that's true, then yeah, better studies need to be done. The fact that the government can mandate this shit and artificially pick winners and losers is insane, and makes this all much more dangerous.
Discussion
It’s not “better studies.” It’s that the most basic form of scientific rigor to test the consequences has not only not been done, but has been deliberately and actively covered up for decades.
There are enough independent studies to show the connection is unmistakable. The only question is just how bad is it.