That same person I think you are refering to, uses "clinical studies" out of context in his list of "sources", but almost never includes a link so you can read the study yourself. What I did was copied down his "sources" and did an investigation myself. I foudn that many of the studies he referenced were not at all what he claimed they were. Same is true for the reports from many of his "experts" that he includes on his website.
My advise: Do you own research and just don't take the word of these folks as Gospel: Investigate.