People got one "shot" then a 2nd. Then, they were told to get a booster 3rd shot. In Israel, they are pushing a 4th shot.
But, the vaxx "trials" (bogus, but let's go with it) were for a TWO-DOSE application.
The FDA approval was for a 2-dose application, not 3 or more. 3 or more has NOT been researched ... AT ALL.
So, if 3 doses is what somebody wants, then there is no FDA approval for that.
Just an idea that might be helpful for some.
All of the currently available vaxxes in the US are still under Emergency Use Authorization (EUA).