For those commenting on bioavailability, black pepper supposedly makes it more bioavailable:

https://examine.com/supplements/curcumin/

It's an interesting result, but they do note that the subpopulation is somewhat self-selected: "Only approximately 15% of the screened volunteers were included in the study, and our recruitment method yielded a sample of motivated, educated, physically healthy subjects concerned about age-related memory problems. The sample, therefore, was not representative of the general population. "