There is no lower threshold level for parathyroid hormone as 25-hydroxyvitamin D concentrations increase.

R Vieth, G El-Hajj Fuleihan

Journal: Journal of endocrinological investigation 2005;28(2):183-6

PMID: 15887868

Abstract

Address: Department of Nutritional Sciences, University of Toronto, and Mount Sinai Hospital, Toronto, Canada. [email protected]

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