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American Journal of Clinical Nutrition, Vol 9, 705-707, Copyright © 1961 by The American Society for Clinical Nutrition, Inc.
1 From The Johns Hopkins University, School of Hygiene & Public Health, Department of Biochemistry, Baltimore, Maryland, and Merck & Co., Inc., Product Development, Rahway, New Jersey
Data involving the measurement of absorbed radioactivity following the oral administration of labeled vitamin B12 are presented which show greater apparent absorption of the vitamin in prefed human subjects or rats, using as a criteria urinary excretion in man and organ (liver and kidneys) uptake or excretion in rats.
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