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Astaxanthin is a keto-carotenoid with various uses including dietary supplement and food dye. It belongs to a larger class of chemical compounds known as terpenes. Astaxanthin is classified as a xanthophyll, but currently employed to describe carotenoid compounds that have oxygen-containing components, hydroxyl (-OH) or ketone (C=O), such as zeaxanthin and canthaxanthin. Indeed, astaxanthin is a metabolite of zeaxanthin and/or canthaxanthin, containing both hydroxyl and ketone functional groups. Like many carotenoids, astaxanthin is a lipid-soluble pigment. Its reddish colour is due to the extended chain of conjugated double bonds at the centre of the compound.   Wikipedia

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3,3'-dihydroxy-beta-carotene-4,4'-dione | astaxanthin | astaxanthine | bioastin | e-astaxanthin | liposomal astaxanthin

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