Pam,
I got interested in the supplement approach after listening to a Dianne Craft tape called The Biology of Learning and Behavior that a friend of mine had picked up at a homeschool conference recently. (I was unable to attend the conference myself, as it happened about a week after Demario arrived.) I then looked into the Dianne Craft website and my research progressed from there.
To read Dianne's articles on the topic, you can go to
http://www.diannecraft.com/articles.html
Hope this helps, and I'd love to hear your feedback after reading the articles and perhaps trying the supplements with Rayon too!
-Susan