No, don't just blindly believe professionals either.

Cause some of them a assholes who try to sow discord for their own personal profit.

Like Andrew Wakefield, who started the whole "Vaccines cause autism!" fraud, because he wanted to sell shit that would benefit from the distrust he was creating and thought undermining faith in existing medicine would be a great marketing ploy.

and theres been tons of famous, formerly reputable doctors since, that have put down their ethics and picked up the snake oil since then. Like Mehmet Oz.