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Plasma concentrations of β-carotene (A), vitamin C (B), vitamin E (C), and magnesium (D) while maintained on a nutritionally complete control diet, and after 20 days of maintenance on a custom diet (TD.08623) with supplemented levels of the above nutrients. There was no reliable change in the plasma concentration of β-carotene. There were statistically reliable increases in the levels of the other active agents.
