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. 2021 Dec 10;13(12):4415. doi: 10.3390/nu13124415

Table 4.

Vitamin D therapeutic doses.

Patient Age Recommended Daily Dose and Duration Recommended Intermittent Dose and Duration
25OH-D Levels < 25 nmol/L
Infants < 1 month 1000 IU/d
3 months		 –
Infants 1–<12 months 2000 IU/d
3 months		 –
Children 1–<11 yrs. 3000–6000 IU/d
3 months		 –
Children 11–<18 yrs. 6000 IU/d
3 months		 50,000 IU/week
1.5–2 months
Adults 6000 IU/d
3 months		 50,000 IU/week
2 months
25OH-D Levels 25–<75 nmol/L
Infants < 1 month

  • Previously taking vit. D supplements: increase dose 1.5–2-fold

  • No previous vit. D supplementation: largest prophylactic dose for age group (Table 3)

  • Duration 2 months

 –
Children 1–10 yrs. –
Children 11–<18 yrs. 25,000 IU/week
2 months
Adults

  • Previously taking vit. D supplements: increase dose 1.5–2-fold

  • No previous vit. D supplementation: largest prophylactic dose for age group (Table 3)

  • Duration 2–3 months

 50,000 IU/week
2 months

IU–international units; 25OH-D–serum 25-hydroxy-vitamin D levels.