Brian,
The concept of chemoprevention is a fascinating topic. I wonder if you could start a section in the Resources part of the web site that would list some valuable references for pursuing information on this topic.

Would you mind sharing why you are taking both tumeric and its active ingredient (curcumin) separately and at what doses?

I would also emphasize the importance of checking with one's doctor(s)before embarking on a chemopreventive routine. For example, in my brief browsing on this issue, I came upon a reference to a study that seems to indicate that tumeric (or curcumin) may inhibit the effectiveness of chemotherapy.
The reference was:

Somasundaram S, Edmund NA, Moore DT, Small GW, Shi YY, Orlowski RZ.
Dietary curcumin inhibits chemotherapy-induced apoptosis in models of human breast cancer. Cancer Res. 2002 Jul 1;62(13):3868-75.

Nonetheless, this seems to be topic that will be of great interest to this board and seems to have real potential for improving the probabilities for oral cancer sufferers. - Sheldon