| Cholecalciferol (D3): 1 mg is equivalent to 40,000 IU | Vitamin D3, 1,000 IU tablets; Delta-D, 400 IU tablets | 125 to 250 mcg per day (5,000 to 10,000 IU) for two to three months or 15,000 mcg (600,000 IU) in four to six divided doses for one day | Oral |
| Ergocalciferol (D2) | Calciferol, Drisdol drops: liquid, 8,000 IU per mL; Drisdol capsules, 50,000 IU; Calciferol injection, 500,000 IU per mL | 25 to 125 mcg per day (1,000 to 5,000 IU) for six to 12 weeks33 | Oral or intramuscular |
| Dihydrotachysterol (DHT)*: 1 mg is approximately equivalent to 3 mg (120,000 IU) of vitamin D2 | DHT tablets, 0.125 mg, 0.2 mg, 0.4 mg; Intensol solution, 0.2 mg per mL; Hytakerol capsules, 0.125 mg | 0.5 mg as a single dose or 13 to 50 mcg per day until healed; 400 mcg of DHT is roughly equivalent to 1,250 mcg of ergocalciferol | Oral |