I can't show you "double-blind" studies showing the safety or the benefit of...
Defibrillators
Seat belts
Helmets
But, that doesn't mean they're not safe and it certainly doesn't mean that they're not great ideas.
As for your charge itself, there's not a drug regulatory agency in the world that has more stringent approval procedures that the FDA. That is a fact and is why so many people with terminal cancers and other diseases travel outside the US for otherwise experimental or unapproved or vetted procedures.
If a vaccine, or any drug for that matter, is approved for use in the US, IT HAS GONE THROUGH EXTENSIVE double-blind trials.
ping for later