FIGURE 4-1. Structure of retinol and provitamin A carotenoids.

FIGURE 4-1

Structure of retinol and provitamin A carotenoids.

From: 4, Vitamin A

Cover of Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc
Dietary Reference Intakes for Vitamin A, Vitamin K, Arsenic, Boron, Chromium, Copper, Iodine, Iron, Manganese, Molybdenum, Nickel, Silicon, Vanadium, and Zinc.
Institute of Medicine (US) Panel on Micronutrients.
Washington (DC): National Academies Press (US); 2001.
Copyright 2001 by the National Academy of Sciences. All rights reserved.

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