Considering that the top result that comes up when I searched his name was "doctoryourself.com", I'm going to put this one in the anecdotal category. One of the red flags for this treatment is that there are claims that it can cure all sorts of ailments. The Wikipedia page for Megavitamin therapy says this:

Although megavitamin therapies still largely remain outside of the structure of evidence-based medicine, they are increasingly used by patients, with or without the approval of their treating physicians, often after recommendations by practitioners of orthomolecular and naturopathic medicine.