I'll just add my tuppence to the fray.
Unfortunately, scientific research requires money. And that's where entities like pharmaceutical companies, with not the best of reputations, come in. And of course companies and orgs with agendas like the tobacco growers association etc that fund research. But, that's why the scientific method is so essential...scientists can come along and falsify any dubious research or claims.
as Cofty said you need to use critical thinking to sift through the marketing, media attention grabs etc to get to the valuable research that is done using the best weapon man has against superstition and bias which is, for now, the scientific method.