title: Natural and synthetic sources of circulating 25-hydroxyvitamin D in man.
mesh_terms: D002112:Calcifediol / Q000097:blood*; D004032:Diet; D005260:Female; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D007011:Hypoparathyroidism / Q000097:blood; D008297:Male; D012016:Reference Values; D014807:Vitamin D
chemical_list: D006887:Hydroxycholecalciferols; D014807:Vitamin D; D002112:Calcifediol