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Summary. Background: The ability of β-carotene to deliver bioactive retinoids to tissues is highly variable. A clearer understanding of the environmental and genetic factors that modulate the vitamin A potential of β-carotene is needed. Aim of study: Assess the vitamin A value of orally administered β-carotene relative to a co-administered reference dose of preformed vitamin A. Methods: Equimolar...
Summary.Background: The ability of -carotene to deliver bioactive retinoids to tissues is highly variable. A clearer understanding of the environmental and genetic factors that modulate the vitamin A potential of -carotene is needed. Aim of study: Assess the vitamin A value of orally administered -carotene relative to a co-administered reference dose of preformed vitamin A. Methods: Equimolar doses...
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