title: Experimentally observed vitamin D requirements are higher than extrapolated ones.
authors.forename: Reinhold
authors.initials: R
authors.lastname: Vieth
mesh_terms: D000368:Aged; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood*; D009751:Nutritional Requirements; D012107:Research Design; D014807:Vitamin D / Q000008:administration & dosage*
chemical_list: D006887:Hydroxycholecalciferols; D014807:Vitamin D