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Vitamin D Dosage Guide

Evidence:Strong
·

This content is for informational purposes only and does not constitute medical advice. Statements about dietary supplements have not been evaluated by the FDA and are not intended to diagnose, treat, cure, or prevent any disease. Individual results may vary — consult your healthcare provider before starting any supplement. Full disclaimer

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

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

Daily immune maintenance
1000-2000 IU dailyStrong
Deficiency correction
4000-5000 IU daily for 8-12 weeksStrong
Respiratory infection prevention
2000-4000 IU dailyStrong

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.

Full Vitamin D Guide

References

  1. Meta-analysisMartineau 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
  2. ReviewAranow C (2011). Vitamin D and the immune system. Journal of Investigative Medicine. DOI PubMed
  3. Meta-analysisKawada K, Sato C, Ishida T, Nagao Y, et al. (2025). Vitamin D Supplementation and Allergic Rhinitis: A Systematic Review and Meta-Analysis.. Medicina (Kaunas, Lithuania). DOI PubMed
  4. Wang R, Xu F, Xia X, Xiong A, et al. (2024). The effect of vitamin D supplementation on primary depression: A meta-analysis.. Journal of affective disorders. DOI PubMed
  5. Fang A, Zhao Y, Yang P, Zhang X, et al. (2024). Vitamin D and human health: evidence from Mendelian randomization studies.. European journal of epidemiology. DOI PubMed
  6. Musazadeh V, Keramati M, Ghalichi F, Kavyani Z, et al. (2023). Vitamin D protects against depression: Evidence from an umbrella meta-analysis on interventional and observational meta-analyses.. Pharmacological research. DOI PubMed
  7. Formisano E, Proietti E, Borgarelli C, Pisciotta L (2023). Psoriasis and Vitamin D: A Systematic Review and Meta-Analysis.. Nutrients. DOI PubMed
Show 5 more references
  1. Meta-analysisYeung WG, Palmer SC, Strippoli GFM, Talbot B, et al. (2023). Vitamin D Therapy in Adults With CKD: A Systematic Review and Meta-analysis.. American journal of kidney diseases : the official journal of the National Kidney Foundation. DOI PubMed
  2. Meta-analysisWilliamson A, Martineau AR, Sheikh A, Jolliffe D, et al. (2023). Vitamin D for the management of asthma.. The Cochrane database of systematic reviews. DOI PubMed
  3. Tamblyn JA, Pilarski NSP, Markland AD, Marson EJ, et al. (2022). Vitamin D and miscarriage: a systematic review and meta-analysis.. Fertility and sterility. DOI PubMed
  4. Abboud M (2022). Vitamin D Supplementation and Sleep: A Systematic Review and Meta-Analysis of Intervention Studies.. Nutrients. DOI PubMed
  5. Palacios C, Kostiuk LK, Pena-Rosas JP (2024). Vitamin D supplementation for women during pregnancy.. The Cochrane database of systematic reviews. DOI PubMed