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“D” by the Numbers
Dietary Reference Intakes (DRI), established by the US Institute of Medicine:
0–50 years: 200 IU (5 mcg*)
51–70 years: 400 IU (10 mcg)
71 or older: 600 IU (15 mcg)
Tolerable Upper Intake: 2,000 IU/day (50 mcg)
Daily Value, as listed on Nutrition Facts labels: 400 IU (10 mcg)
American Academy of Pediatrics recommendation for breast-fed infants: 400 IU/day soon after birth until weaning
Deficiency: 0–20 ng/ml (0–30 nmol/l)
Insufficiency: 21–30 ng/ml (51–75 nmol/l)
Sufficient: 30–100 ng/ml (76–249 nmol/l)
Toxicity: greater than 100 ng/ml (250 nmol/l)
†These ranges are generally accepted, but there is currently no standard set.
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