title: There is no lower threshold level for parathyroid hormone as 25-hydroxyvitamin D concentrations increase.
authors.affiliation: Department of Nutritional Sciences, University of Toronto, and Mount Sinai Hospital, Toronto, Canada. rvieth@mtsinai.on.ca
authors.forename: R
authors.initials: R
authors.lastname: Vieth
authors.forename: G
authors.initials: G
authors.lastname: El-Hajj Fuleihan
mesh_terms: D004056:Differential Threshold; D006801:Humans; D010281:Parathyroid Hormone / Q000097:blood*; D014807:Vitamin D / Q000031:analogs & derivatives* / Q000097:blood*
chemical_list: D010281:Parathyroid Hormone; D014807:Vitamin D; C104450:25-hydroxyvitamin D