And the existence of class action suits are proof of what exactly?
Tons of things. Bias, fake studies, completely botched studies. If you word things cleverly you can create a world of imagination without completely lying.
Sure, there are lots of flawed studies. But these companies just grab snippets from Pubmed abstracts, string it together and that's their R&D. Seriously. When I was popular on bodybuilding.com there were some companies that paid me in supplements to do their write ups.