Convert between International Units (IU) and micrograms (µg) for supplement doses, or between ng/mL and nmol/L for serum 25-hydroxyvitamin D lab results.
| IU | µg | Context |
|---|---|---|
| 400 | 10 | AAP infant AI · IOM RDA under age 1 |
| 600 | 15 | IOM RDA ages 1–70 |
| 800 | 20 | IOM RDA ages 71+ |
| 1,000 | 25 | Common OTC maintenance dose |
| 2,000 | 50 | Endocrine Society sufficiency dose |
| 4,000 | 100 | IOM Tolerable Upper Intake Level |
| 50,000 | 1250 | Clinical repletion single-dose |