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Curcumin [(E,E)-1,7-bis(4-hydroxy-3-methoxy-phenyl)-1,6-heptadiene-3,5-ione]  is the main phenolic pigment extracted from turmeric, the powdered rhizome of Curcuma longa, along with demethoxy curcumin and bisdemethoxy curcumin.

It is commonly used as a spice, food preservative, and flavoring and coloring agent. Extensive research over the last 5 decades indicates that curcumin possesses potent antioxidant, anti-inflammatory, antitumor, anti-HIV, and antimicrobial properties.