Psyllium Husk for Irritable Bowel Syndrome (IBS)
BACG recommends soluble fiber (psyllium) over insoluble fiber for IBS. Improves global IBS symptoms with particular benefit in IBS-C. NNT of 7 for global symptom improvement.
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B
The Bottom Line
ACG recommends soluble fiber (psyllium) over insoluble fiber for IBS. Improves global IBS symptoms with particular benefit in IBS-C. NNT of 7 for global symptom improvement.
Key Study Findings
Observational Study
n=97
Survey of Latin American gastroenterologists, specialists in disorders of gut-brain interaction, on the diagnosis and …
Dose: None
vs: None
Outcome: IBS management heterogeneity in Latin America
Effect: None
None
Population: Latin American gastroenterologists (DGBI specialists)
Review
The role of dietary fiber in the gastrointestinal tract: when, how and why?
Dose: None
vs: None
Outcome: None
Effect: None
None
Population: Review of dietary fiber role in GI tract
Randomized Controlled Trial
3 weeks
Double-blind
Nutraceuticals and Pain Disorders of the Gut-Brain Interaction in Infants and Children: A Narrative Review …
Dose: None
vs: Placebo
Outcome: Pain outcomes
Effect: None
None
Population: IBS patients
Review
The role and therapeutic effectiveness of Plantago ovata seed husk (psyllium husk) in the prevention …
Dose: None
vs: None
Outcome: Colitis severity
Effect: None
None
Population: Ulcerative colitis patients
Systematic Review
[Phytotherapeutic recommendations in medical guidelines for the treatment of gastroenterological diseases - a systematic review].
Dose: Peppermint oil, STW-5, psyllium, others
vs: Standard care or placebo
Outcome: Symptom improvement in GI diseases
Effect: None
None
Population: Patients with gastroenterological diseases
Randomized Controlled Trial
n=314
Sex-Dependent Efficacy of Dietary Fiber in Pediatric Functional Abdominal Pain.
Dose: Dietary fiber (psyllium)
vs: Low fiber diet
Outcome: Abdominal pain frequency
Effect: None
None
Population: Children with functional abdominal pain disorders
Key Statistics
8
Studies
900
Participants
↑
Positive
B
Grade
Referenced Papers
Best practice & …
2025
1 citations
The Medical letter …
2025
The Medical letter …
2025
Revista de gastroenterologia …
2025
The Medical letter …
2025
Gastroenterology
2024
8 citations
Nutrients
2024
5 citations
Przeglad gastroenterologiczny
2024
4 citations
[Phytotherapeutic recommendations in medical guidelines for the treatment of gastroenterological diseases - a systematic review].
Systematic Review
Zeitschrift fur Gastroenterologie
2024
3 citations
Gastroenterology
2024
3 citations
Dietary Fibers in Healthy Children and in Pediatric Gastrointestinal Disorders: A Practical Guide.
Review
Nutrients
2023
43 citations
The American journal …
2023
39 citations
Nutrients
2023
32 citations
Journal of pediatric …
2023
21 citations
Nutrients
2023
4 citations
Journal of pediatric …
2023
1 citations
In persons with constipation or IBS-C, kiwifruit vs. psyllium increased spontaneous bowel movements.
Other
Annals of internal …
2023
Gut
2022
39 citations
American journal of …
2022
18 citations
Expert review of …
2022
8 citations
The Turkish journal …
2021
14 citations
Current opinion in …
2021
6 citations
The lancet. Gastroenterology …
2020
119 citations
The Medical letter …
2020
Journal of the …
2019
171 citations
World journal of …
2019
14 citations
International journal of …
2017
146 citations
Probiotics, fibre and herbal medicinal products for functional and inflammatory bowel disorders.
Review
British journal of …
2017
145 citations
Clinical gastroenterology and …
2017
93 citations
Journal of gastroenterology …
2017
32 citations
Current opinion in …
2017
24 citations
International journal of …
2016
69 citations
Clinical gastroenterology and …
2016
2 citations
Digestion
2014
61 citations
The American journal …
2013
421 citations
Journal of clinical …
2011
30 citations
Alimentary pharmacology & …
2011
3 citations
Canadian journal of …
2011
Current opinion in …
2010
22 citations
BMJ (Clinical research …
2009
296 citations
Australian family physician
2009
12 citations
Prescrire international
2009
BMJ (Clinical research …
2008
550 citations
International journal of …
2007
375 citations
Digestive diseases and …
2006
70 citations
Current treatment options …
2006
24 citations
Systematic review: the role of different types of fibre in the treatment of irritable bowel syndrome.
Systematic Review
Alimentary pharmacology & …
2004
322 citations
Gut
1987
153 citations
Biomedicine & pharmacotherapy …
1986
4 citations
Annals of internal …
1981
91 citations
Annals of internal …
1981
6 citations
IRRITABLE COLON.
Other
JAMA
1964
Dosage & Usage
mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units
Commonly Used Dosages
- general:
- 5-10 g/day (with adequate water)
- ibssupport:
- 5-10 g/day (start low, titrate up over 1-2 weeks)
- constipation:
- 10-20 g/day in divided doses with at least 240 mL water per dose
Upper limit: Well-tolerated up to 30 g/day with adequate fluid intake
Dosages Studied in Research
| Dosage | Duration | Effect | N |
|---|---|---|---|
| None | -- | Mixed | 97 |
| None | -- | Mixed | -- |
| None | 3 weeks | Positive | -- |
| None | -- | Positive | -- |
| Peppermint oil, STW-5, psyllium, others | -- | Positive | -- |
| Dietary fiber (psyllium) | -- | Positive | 314 |
| 2 g | -- | Mixed | -- |
| Low-FODMAP, probiotics, fiber | -- | Positive | -- |
Best taken: With meals and a full glass of water (240 mL minimum); space 1-2 hours from medications
Safety & Side Effects
Reported Side Effects
- ⚠ Gas and bloating (common initially; start with low dose and titrate up)
- ⚠ Esophageal/bowel obstruction if taken without adequate water (CRITICAL: always take with full glass of water)
- ⚠ Abdominal cramping at high initial doses
- ⚠ May reduce appetite (feeling of fullness)
Known Interactions
- ● May reduce absorption of medications if taken simultaneously (space 1-2 hours)
- ● Lithium (reduced absorption)
- ● Carbamazepine (reduced absorption)
- ● Diabetes medications (may enhance blood sugar lowering; monitor glucose)
Tolerable upper intake: Well-tolerated up to 30 g/day with adequate fluid intake
Always consult your healthcare provider before starting any supplement.
Frequently Asked Questions
Does Psyllium Husk help with Irritable Bowel Syndrome (IBS)?
Based on 8 studies with 900 participants, there is moderate evidence from clinical studies that Psyllium Husk may support Irritable Bowel Syndrome (IBS) management. Our evidence grade is B (Good Evidence).
How much Psyllium Husk should I take for Irritable Bowel Syndrome (IBS)?
Studies have used various dosages. A commonly studied range is 5-10 g/day (with adequate water). Always consult your healthcare provider before starting any supplement regimen.
Are there side effects of Psyllium Husk?
Reported side effects may include Gas and bloating (common initially; start with low dose and titrate up), Esophageal/bowel obstruction if taken without adequate water (CRITICAL: always take with full glass of water), Abdominal cramping at high initial doses, May reduce appetite (feeling of fullness). Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.
How strong is the evidence for Psyllium Husk and Irritable Bowel Syndrome (IBS)?
We rate the evidence as Grade B (Good Evidence). This rating is based on 8 peer-reviewed studies with 900 total participants. The overall direction of effect is positive.
Related Evidence
Other ingredients for Irritable Bowel Syndrome (IBS)
Psyllium Husk 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.