title: Vitamin D: how much do we need, and how much is too much?
authors.forename: R P
authors.initials: RP
authors.lastname: Heaney
mesh_terms: D000367:Age Factors; D019587:Dietary Supplements; D006801:Humans; D006887:Hydroxycholecalciferols / Q000097:blood; D008875:Middle Aged; D018673:Nutrition Policy; D017410:Practice Guidelines as Topic; D014807:Vitamin D / Q000008:administration & dosage*; D014808:Vitamin D Deficiency / Q000178:diet therapy*
chemical_list: D006887:Hydroxycholecalciferols; D014807:Vitamin D