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Detection of free carotenoids and carotenoid esters in the supplements using HPLC–DAD with a C30 column. Unesterified lutein (L), unesterified total zeaxanthin (tZ) and esterified zeaxanthin (peaks I–III as example). EP Eyepromise Restore®; PV Preservision AREDS2®; MH MacuHealth with LMZ3®; MS Macushield®; UL Ultra Lutein®; NO Nutrof®omega; VI Vitalux Plus®; OC Ocuvite® L Plus; CE CentroVision® L Forte
