The rhizomes of curcuma longa, a relative of gin-ger, are the raw material from which the spice turmeric is derived (Higdon et al., 2012). Turmeric's bright yellow color comes from curcuminoids, fat-soluble polyphenols. Turmeric extracts are often used as food-coloring agents. Curcumin is the most abundant curcuminoid in turmeric.
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