Well, now, have I got something for you! Just right here, in this bottle, I have a medication that is not only federally guaranteed not to hurt you, but also will fix your problem right up! And it's just $10,000 per bottle! Step right up!
My guess is your insurance doesn’t cover every approved treatment. But if it does, is that a problem with the FDA (which regulates drugs), or with your insurance policy (which decides how to pay for them)? I’d suggest your complaints about insurance costs are more closely tied to the latter.
If only there was some group of experts that decided that some drugs were safe and effective vs. not. We could even make it a nonprofit group to avoid conflicts. Heck, we could get the federal government to fund and and even pass a law that gave their recommendations teeth.
Or do you mean in the cases where there are already treatments? Because, yes, then take medicine not Dr. Mike's Magic Tonic.