title: Long biological half-life of vitamin D3 and its polar metabolites in human serum.
mesh_terms: D000293:Adolescent; D000328:Adult; D002247:Carbon Isotopes; D002762:Cholecalciferol / Q000097:blood* / Q000378:metabolism; D002845:Chromatography; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D007676:Kidney Failure, Chronic / Q000097:blood*; D008297:Male; D008875:Middle Aged
chemical_list: D002247:Carbon Isotopes; D002762:Cholecalciferol