: Plasma concentrations Of Beta-Carotene and Retinol I'm doing an analysis, and retinol and beta carotene are involved. I need to know : 1) Normal levels of dietary beta carotene and Retinol consumed (mcg per day); 2) Normal

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Plasma concentrations Of Beta-Carotene and Retinol
I'm doing an analysis, and retinol and beta carotene are involved.
I need to know :

1) Normal levels of dietary beta carotene and Retinol consumed (mcg per day);

2) Normal levels of plasma retinol and Beta carotene (ng/ml);

3) Is it possible a plasma beta carotene equals zero?

I'm talking about intervals. Which values are considered to be too high or too small?

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