HYPERVITAMINOSIS A AND THE DISTRIBUTION OF BODY IODINE

Abstract
50 adult male albino rats were divided into 3 groups. Two exptl. series received daily doses of 15,000 and 20,000 I.U. of vitamin A orally for 14 and 18 days, respectively. Hypervitaminosis A was accompanied by a decrease in protein-bound iodine in the liver and thyroid, and by an increase in protein-bound iodine in serum, pituitary and skeletal muscle. The authors suggest these results are due to a decreased hepatic destruction of thyroxine with consequent hyperthyroxinemia.