Health is better at serum 25(OH)D above 30Â ng/mL

▸ There is good evidence for benefits produced by 25(OH)D values above 20 ng/mL. ▸ Results of RCTs of vitamin D at doses below 800 IU/d have been inconsistent. ▸ Inadequate dose and failure to consider basal vitamin D status are partial reasons. ▸ For nutrients, the relevant question is not “whether?” but “how much?”. ▸ RCTs are poorly suited to answer such qualitative questions.