[bittercynic]

>...we should always be questioning...

I partially agree, or at least think we shouldn't be discouraged from questioning, but there's only so many hours in a day, and a person can digest a finite amount of information.

I choose to trust US health authorities. Flawed as they may be, I think it would be worse to somehow try to verify every claim, or come to my own conclusions on every single question. I won't judge you for making a choice different from my own, but for me, and I suspect many (most?) people, having a doctor who you trust, following their recommendations, and getting on with your life might be the best strategy.