Yes, the clinical studies are still in the early stages.

Here is one investigating the effects of curcumin on cognitive decline of older adults and also change in inflammation markers. Hopefully they are using the more active forms during these trials. I have heard that Alzheimer's disease has a very low occurence in India which could be attributed to their use of tumeric.

http://clinicaltrials.gov/show/NCT01383161


I take one capsule of green tea extract and one capsule of bio-curcumin with food. I probably don't need to be concerned with effects of these supplements on other vitamins & minerals.

Edit: They are using theracumin in the trial which should provide an excellent bio available source.