The United States Food and Drug Administration (FDA) Updated Units for Dosing Equivalents of Vitamin D
| Old Units (International Units [IU]) | New Units (Micrograms [mcg]) |
|---|---|
| 400 IU | 10 mcg |
| 800 IU | 20 mcg |
| 1000 IU | 25 mcg |
| 2000 IU | 50 mcg |
| 5000 IU | 125 mcg |
| 50,000 IU | 1250 mcg |