1986 is a long time ago. There have been many advances in science, medicine, AND technology to research medicine, such as DNA mapping. What kind of studies were these, 20 -50 participants? empirical evidence based? Just one study?
Just because 'a study' was done and gave good results does ot write in stone the effectiveness of a product or substance. Any college grad can study any substance with 1-2 subjects and produce positive results....
Get stricter about Science studies, board members. Science is your friend regardless of how natural or 'un-natural' you opinion thinks it is.