Lightbringer, I do not have the URLs for the herbology lessons, but they are all in this forum, just go back a few pages and you will be sure to find them.
I am reading a wonderful book on transdermal magnesium therapy. It says that a lack of magnesium can contribute to diabetes developing. Perhaps your friend can benefit from a dose of bioavailable magnesium from either a supplement like magnesium citrate or magnesium chloride, or a good quality green drink. I am enjoying a hot mug of cinnamon green tea, even a humble spice like cinnamon is said to help control blood sugar. Hopefully your friend can get a sense of control if not relief of his diabetes with Dr. Dennis' herbal recommendations.