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Serum lutein and macular pigment optical density (MPOD). Rate of change of MPOD (milli-Absorbance units) as a function of fractional change in serum lutein concentration (plateau value minus pre-supplementation value, divided by pre-supplementation value). Data from 46 healthy subjects randomly assigned to 0, 5, 10, and 20 mg of free, unesterified lutein in soft-shell gelatin capsules and whose standard deviations in the rates of change of MPOD were <0.250. From [83].
