Figure 1.

Chemical structures of the principal constituents of curcuminoid. Shown are the three predominant curcuminoids found in natural mixtures. Curcumin is commonly observed to be the major material, whereas demethoxycurcumin and bisdemethoxycurcumin are relatively minor constituents.

Cashman et al. BMC Neuroscience 2008 9(Suppl 2):S13   doi:10.1186/1471-2202-9-S2-S13