Unless they're paid off by big corporations to do studies favorable to a company's products, in which case they bring nice sounding lies. Like how Monsanto wrote entire passages of the paper supposedly proving the safety of their glyphosate.

Source

This shit killed my grandma in her late 60s along with millions of others worldwide.

But I think this is due to a broader incentive problem in science. There's incentive to find new and interesting things to publish or die. There's no incentive (in fact strong incentives against) replicating other studies to see if their results hold up to external verification.