General Dosage
2000-4000 IU (50-100mcg) vitamin D3 daily with a fat-containing meal
Maximum dose: 4000 IU/day (tolerable upper intake level); up to 10,000 IU/day used clinically under supervision
Vitamin D Dosage Guide
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Dosage Recommendations
General recommendation: 2000-4000 IU (50-100mcg) vitamin D3 daily with a fat-containing meal
Timing: With the largest fat-containing meal of the day for optimal absorption • Take with food for best absorption.
Dosage by Condition
| Condition | Recommended Dose | Evidence |
|---|---|---|
| Daily immune maintenance | 1000-2000 IU daily | Strong |
| Deficiency correction | 4000-5000 IU daily for 8-12 weeks | Strong |
| Respiratory infection prevention | 2000-4000 IU daily | Strong |
Upper limit: 4000 IU/day (tolerable upper intake level); up to 10,000 IU/day used clinically under supervision
Timing & Absorption
With the largest fat-containing meal of the day for optimal absorption
Best taken with food for optimal absorption.
References
- Martineau AR, Jolliffe DA, Hooper RL, et al. (2017). Vitamin D supplementation to prevent acute respiratory tract infections: systematic review and meta-analysis of individual participant data. BMJ. DOI PubMed
- Aranow C (2011). Vitamin D and the immune system. Journal of Investigative Medicine. DOI PubMed