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Lutein, β-carotene, and lycopene are among the most common carotenoids present in human milk and are frequently added to infant formula and adult nutritionals. A collaborative study was conducted to assess the interlaboratory performance of AOAC Official MethodSM2016.13 for the determination of lutein, β-carotene, and lycopene in infant formula and adult nutritionals. Thirteen laboratories agreed to participate in the study and 10 laboratories from seven different countries reported results. The study samples included blind duplicates o