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The effect of lutein and zeaxanthin supplementation on metabolites of these carotenoids in the serum of persons aged 60 or older.

Khachik F, de Moura FF, Chew EY, Douglass LW, Ferris FL 3rd, Kim J, Thompson DJ. Khachik F, et al. Invest Ophthalmol Vis Sci. 2006 Dec;47(12):5234-42. doi: 10.1167/iovs.06-0504. Invest Ophthalmol Vis Sci. 2006. PMID: 17122108 Clinical Trial.

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Dose-ranging study of lutein supplementation in persons aged 60 years or older.

Rosenthal JM, Kim J, de Monasterio F, Thompson DJ, Bone RA, Landrum JT, de Moura FF, Khachik F, Chen H, Schleicher RL, Ferris FL 3rd, Chew EY. Rosenthal JM, et al. Invest Ophthalmol Vis Sci. 2006 Dec;47(12):5227-33. doi: 10.1167/iovs.05-1513. Invest Ophthalmol Vis Sci. 2006. PMID: 17122107 Clinical Trial.

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