Difficulties with vitamin D nutrition research: objective targets of adequacy, and assays for 25-hydroxyvitamin D.
Vieth
R
R
Carter
G
G
D006801:Humans; D018673:Nutrition Policy; D009751:Nutritional Requirements; D014481:United States; D014807:Vitamin D / Q000008:administration & dosage* / Q000031:analogs & derivatives* / Q000097:blood*
D014807:Vitamin D; C104450:25-hydroxyvitamin D