A man or woman in a white coat, with so many titles, PhD, MD, APC, PDP, etc, representing a big conglomerate, is paid to tell you "don't mind those ignorant fools, telling you our products are not good. I am the qualified expert, I am telling you that they are wrong, and you should go ahead and use our products".
Remember with time, we will know, which of the two is right. And if by chance, the expert turns out wrong, it is you and your loved ones that will bear the consequences.
So always do your research by buying books on the topics written by doctors for and against every topic and products. You can't get much on free informations, the experts, have used that medium to downgrade helpful products. So invest in your health, buy books.