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Curcumin is a water-soluble bright yellow (orange-yellow) chemical produced by Curcuma longa plants. It is the principal curcuminoid of turmeric (Curcuma longa), a member of the ginger family, Zingiberaceae. The other curcuminoids are demethoxycurcumin and bisdemethoxycurcumin. While turmeric contains only 2 - 9% curcuminoids, 75% of these active curcuminoids are curcumin, which is why curcumin is the "star" of turmeric.