Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A vitamin precursor that the body converts to its active form through normal metabolic processes. Carotene, for example, is a provitamin of vitamin A.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun biochemistry Any biologically inactive compound that may be converted into a
vitamin within an animal organism
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun vitamin precursor; a substance that is converted into a vitamin in animal tissues
Etymologies
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Examples
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Breeding to increase β-carotene levels in cereal grains, termed provitamin A biofortification, is an economical approach to address dietary vitamin A deficiency in the developing world.
Naturejobs - All Jobs Jianbing Yan 2010
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The stress of the bad hip fracture and recovery may have catalyzed cancer onset, because provitamin D is converted to its active form, D3, by a hormone called ACTH that is responsive to biological stress.
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They therefore proposed that carotene is a provitamin, an immediate precursor to
Richard Kuhn and the Chemical Institute: Double Bonds and Biological Mechanisms 2010
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The stress of the bad hip fracture and recovery may have catalyzed cancer onset, because provitamin D is converted to its active form, D3, by a hormone called ACTH that is responsive to biological stress.
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For example, in skin vitamin D is produced from UV-B-induced photoconversion of 7-dehydrocholesterol (7-DHC; provitamin D).
Potential impacts of direct mechanisms of climate change on human health in the Arctic 2009
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Good fruit and vegetable sources of provitamin A include carrots, yellow squash, red and green peppers, spinach, kale, and other green leafy vegetables.
Eat, Drink, and Be Healthy M.D. Walter C. Willett 2005
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Food gives you either preformed, ready-to-go vitamin A or provitamin A that your body can readily convert to active vitamin A.
Eat, Drink, and Be Healthy M.D. Walter C. Willett 2005
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Good fruit and vegetable sources of provitamin A include carrots, yellow squash, red and green peppers, spinach, kale, and other green leafy vegetables.
Eat, Drink, and Be Healthy M.D. Walter C. Willett 2005
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Food gives you either preformed, ready-to-go vitamin A or provitamin A that your body can readily convert to active vitamin A.
Eat, Drink, and Be Healthy M.D. Walter C. Willett 2005
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All these plants are excellent sources of beta carotene provitamin A, vitamin C, calcium, iron sodium, potassium, phosphorus, and sulfur.
THE NATURAL REMEDY BIBLE JOHN LUST 2003
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