Vitamin D for Inflammatory Bowel Disease (IBD) — General
BSupplementation (1,000-4,000 IU/day) reduces relapse risk in both UC and Crohn's. Deficiency is common in IBD (up to 60%) and correlates with disease severity.
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B
The Bottom Line
Supplementation (1,000-4,000 IU/day) reduces relapse risk in both UC and Crohn's. Deficiency is common in IBD (up to 60%) and correlates with disease severity.
Key Study Findings
Review
Early Evidence Indicates Vitamin D Improves Symptoms of Irritable Bowel Syndrome: Nursing Implications and Future …
Dose: None
vs: None
Outcome: IBS symptom improvement with vitamin D supplementation
Effect: None
None
Population: individuals with irritable bowel syndrome
Review
Diet in Ulcerative Colitis: A Narrative Review of Its Role in Pathogenesis and Treatment.
Dose: None
vs: None
Outcome: None
Effect: None
None
Population: patients with ulcerative colitis
Review
Probiotics in inflammatory bowel disease: microbial modulation and therapeutic prospects.
Dose: None
vs: None
Outcome: None
Effect: None
None
Population: review of probiotics as therapeutic strategy for inflammatory bowel disease
Review
Micronutrient Deficiencies in Pediatric IBD: How Often, Why, and What to Do?
Dose: None
vs: None
Outcome: Micronutrient deficiency management in pediatric IBD
Effect: None
None
Population: Children with inflammatory bowel disease (review)
Observational Study
n=193
The importance of vitamin D levels in patients with inflammatory bowel disease.
Dose: None
vs: Clinical activity groups and VD status groups
Outcome: Vitamin D levels and IBD activity markers
Effect: None
0.009 (CD), 0.033 (UC), 0.032
Population: Greek IBD patients (122 CD, 71 UC)
Review
Osteoporosis: A Review.
Dose: None
vs: None
Outcome: None
Effect: None
None
Population: Adults with osteoporosis
Key Statistics
10
Studies
1500
Participants
↑
Positive
B
Grade
Referenced Papers
Gastroenterology nursing : …
None
4 citations
Digestive diseases and …
2026
1 citations
Trends in molecular …
2025
35 citations
Arquivos de neuro-psiquiatria
2025
6 citations
Nutrients
2025
4 citations
Journal of physiology …
2025
3 citations
The American journal …
2025
CCL20 expression is elevated in inflammatory bowel disease and attenuated by vitamin D metabolites.
Other
Scientific reports
2025
Osteoporosis: A Review.
Review
JAMA
2025
Nutrients
2024
47 citations
Nutrients
2024
27 citations
Swiss medical weekly
2024
9 citations
Nutricion hospitalaria
2024
2 citations
Asia Pacific journal …
2024
1 citations
Paediatrics and international …
2023
48 citations
The American journal …
2023
37 citations
Vitamin D therapy in pediatric patients with inflammatory bowel disease: a systematic review and meta-analysis.
Meta-Analysis
World journal of …
2023
11 citations
Frontiers in pediatrics
2023
6 citations
JGH open : …
2023
5 citations
Toxicology mechanisms and …
2023
5 citations
Archives of Iranian …
2023
2 citations
Vitamin D for the treatment of inflammatory bowel disease.
Systematic Review
The Cochrane database …
2023
1 citations
Endocrine connections
2022
50 citations
Journal of inflammation …
2022
50 citations
Autoimmunity reviews
2022
44 citations
Frontiers in bioscience …
2022
17 citations
PloS one
2022
10 citations
Medwave
2022
4 citations
European journal of …
2021
40 citations
Effects of oral vitamin D supplementation on inflammatory bowel disease: a systematic review and meta-analysis.
Meta-Analysis
Food & function
2021
25 citations
Vitamin D Supplementation and Mental Health in Inflammatory Bowel Diseases and Irritable Bowel Syndrome Patients: A Systematic Review.
Systematic Review
Nutrients
2021
16 citations
Vitamin D Therapy in Adults With Inflammatory Bowel Disease: A Systematic Review and Meta-Analysis.
Meta-Analysis
Inflammatory bowel diseases
2020
57 citations
Autoimmunity reviews
2020
48 citations
Acta biochimica Polonica
2020
10 citations
The Korean journal …
2020
3 citations
Revista espanola de …
2020
2 citations
Nutrients
2019
193 citations
Frontline gastroenterology
2019
58 citations
Critical reviews in …
2019
45 citations
Complementary therapies in …
2019
27 citations
Current drug metabolism
2019
7 citations
Current opinion in …
2019
5 citations
Current opinion in …
2018
94 citations
Gastroenterology clinics of …
2018
67 citations
Journal of research …
2018
48 citations
Vitamin D status in irritable bowel syndrome and the impact of supplementation on symptoms: what do we know and what …
Systematic Review
European journal of …
2018
39 citations
Gastroenterology
2017
335 citations
Fat-soluble Vitamin Deficiencies and Inflammatory Bowel Disease: Systematic Review and Meta-Analysis.
Meta-Analysis
Journal of clinical …
2017
73 citations
Nutrition in clinical …
2017
55 citations
PloS one
2017
38 citations
Control of Inflammatory Bowel Disease and Colorectal Cancer by Synthetic Vitamin D Receptor Ligands.
Review
Current medicinal chemistry
2017
14 citations
Clinical gastroenterology and …
2017
8 citations
Ugeskrift for laeger
2017
World journal of …
2016
238 citations
World journal of …
2016
122 citations
Iron Deficiency, Zinc, Magnesium, Vitamin Deficiencies in Crohn's Disease: Substitute or Not?
Review
Digestive diseases (Basel, …
2016
41 citations
Dietary Supplement Therapies for Inflammatory Bowel Disease: Crohn's Disease and Ulcerative Colitis.
Review
Current pharmaceutical design
2016
32 citations
Current gastroenterology reports
2016
22 citations
Journal of medicinal …
2016
17 citations
Gastroenterology & hepatology
2016
7 citations
Association Between Inflammatory Bowel Disease and Vitamin D Deficiency: A Systematic Review and Meta-analysis.
Meta-Analysis
Inflammatory bowel diseases
2015
214 citations
BioMed research international
2015
149 citations
World journal of …
2015
62 citations
The Proceedings of …
2015
46 citations
Healthcare (Basel, Switzerland)
2015
7 citations
Journal of inflammation …
2014
411 citations
Experimental biology and …
2014
131 citations
World journal of …
2014
117 citations
Vitamin and zinc status pretreatment and posttreatment in patients with inflammatory bowel disease.
Other
Journal of pediatric …
2014
38 citations
Inflammatory bowel diseases
2012
224 citations
Alimentary pharmacology & …
2012
111 citations
Current drug metabolism
2012
28 citations
Vitamins and hormones
2011
25 citations
Current opinion in …
2011
23 citations
Vitamin D and inflammation.
Review
Joint bone spine
2010
281 citations
Acta medica Indonesiana
2007
4 citations
Nature clinical practice. …
2005
191 citations
Alimentary pharmacology & …
2003
179 citations
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- general:
- 600-800 IU/day (RDA)
- ibdsupport:
- 1,000-4,000 IU/day (target serum 25(OH)D >30 ng/mL)
- deficiencycorrection:
- 50,000 IU/week for 8 weeks, then 1,000-4,000 IU/day maintenance
Upper limit: 4,000 IU/day (100 mcg); higher doses under medical supervision only
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Positive | -- |
| None | -- | Mixed | -- |
| None | -- | Positive | -- |
| None | -- | Neutral | -- |
| None | -- | Negative | 193 |
| None | -- | Mixed | -- |
| None | 690 weeks | Neutral | 357656 |
| None | -- | Positive | 310 |
Best taken: With a meal containing fat for better absorption
Safety & Side Effects
Reported Side Effects
- ⚠ Hypercalcemia at very high doses (nausea, vomiting, weakness, confusion)
- ⚠ Kidney stones with excessive long-term supplementation
- ⚠ Constipation
- ⚠ Metallic taste
Known Interactions
- ● Thiazide diuretics (may increase risk of hypercalcemia)
- ● Corticosteroids (reduce vitamin D absorption and metabolism)
- ● Orlistat and cholestyramine (reduce fat-soluble vitamin absorption)
- ● Statins (vitamin D may affect statin metabolism)
Tolerable upper intake: 4,000 IU/day (100 mcg); higher doses under medical supervision only
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Vitamin D help with Inflammatory Bowel Disease (IBD) — General?
Based on 10 studies with 1,500 participants, there is moderate evidence from clinical studies that Vitamin D may support Inflammatory Bowel Disease (IBD) — General management. Our evidence grade is B (Good Evidence).
How much Vitamin D should I take for Inflammatory Bowel Disease (IBD) — General?
Studies have used various dosages. A commonly studied range is 600-800 IU/day (RDA). Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Vitamin D?
Reported side effects may include Hypercalcemia at very high doses (nausea, vomiting, weakness, confusion), Kidney stones with excessive long-term supplementation, Constipation, Metallic taste. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for Vitamin D and Inflammatory Bowel Disease (IBD) — General?
We rate the evidence as Grade B (Good Evidence). This rating is based on 10 peer-reviewed studies with 1,500 total participants. The overall direction of effect is positive.
Related Evidence
Other ingredients for Inflammatory Bowel Disease (IBD) — General
Vitamin D for other conditions
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products and information on this website are not intended to diagnose, treat, cure, or prevent any disease. The evidence grades presented are based on our analysis of published peer-reviewed research and do not constitute medical advice. Always consult your healthcare provider before starting any supplement regimen.