Here is Chicago Magazine's feature story on the man: "Dr. Mercola: Visionary or Quack?" My great disappointment is that the word "visionary" is even considered an option in describing the man. However, if "visionary" means...finding a crack in the seams of a vulnerable mind and exploiting it to successfully extract the most cash, then yes, he is a "visionary".
For your enjoyment, please also enjoy Dr. Stephen Barrett's Quackwatch article: "FDA Orders Dr. Joseph Mercola
to Stop Illegal Claims"
You can decide whether Mercola is a master marketer or a quack (with credentials).
Don't forget to read his disclaimer:
"Disclaimer: The entire contents of this website are based upon the opinions of Dr. Mercola, unless otherwise noted. Individual articles are based upon the opinions of the respective author, who retains copyright as marked. The information on this website is not intended to replace a one-on-one relationship with a qualified health care professional and is not intended as medical advice. It is intended as a sharing of knowledge and information from the research and experience of Dr. Mercola and his community. Dr. Mercola encourages you to make your own health care decisions based upon your research and in partnership with a qualified health care professional."
Notice...these are his opinions.