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Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines
Open accessAbstract
Irritable Bowel Syndrome (IBS) affects 4–15% of the global population, and the limited efficacy of existing pharmacologic therapies has driven growing interest in plant-based therapeutic options among both patients and clinicians. A comprehensive assessment of all plant extracts investigated in IBS is therefore essential, given the limited effectiveness of conventional treatments and the increasing interest in complementary approaches. Evidence from recent systematic reviews and meta-analyses consistently indicates that peppermint oil is the most effective botanical agent, particularly for reducing abdominal pain and overall IBS symptom severity. Iberogast (STW-5 and STW-5 II) has also demonstrated clinical improvements across multiple trials, while curcumin shows mechanistic and preliminary clinical potential by modulating several IBS-related pathways. In contrast, extracts such as Curcuma xanthorrhiza, Fumaria officinalis, and various Ayurvedic formulations have not shown significant clinical benefit. Other agents, including Aloe vera, flavonoids, St John’s wort, and ginger, exhibit mixed or inconsistent results, reflecting heterogeneity in study designs and underlying mechanisms. A review of international guidelines reveals that peppermint oil is the only plant-based therapy consistently acknowledged across adult and pediatric recommendations. The aim of this review is to summarize, compare, and critically evaluate all plant extracts studied for the prevention and treatment of IBS, integrating mechanistic pathways, clinical evidence, and current international guideline recommendations to clarify their therapeutic relevance for clinical practice.
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TL;DR
This narrative review synthesizes clinical, mechanistic, and guideline evidence on plant-derived treatments for IBS. Peppermint oil is the most consistently effective and the only plant-based therapy broadly recommended across international adult and pediatric guidelines, while Iberogast, curcumin, and some TCM/Kampo formulations show more limited or region-specific evidence and several other extracts lack demonstrated efficacy.
Key findings
- Peppermint oil was the most studied and effective botanical agent, with meta-analyses finding it safe and superior to placebo for abdominal pain and global IBS symptoms. Trials reported improvements at 4 weeks (p < 0.009), 8 weeks (p < 0.001), and in a 190-patient trial for abdominal pain (p = 0.016), abdominal discomfort (p = 0.020), and IBS symptom severity (p = 0.020), though overall symptom relief was not significant (p = 0.170); a phase 3 trial in 69 Japanese patients showed significant improvements in symptom severity, stool frequency, patient global assessment, and stool form. Guidelines consistently acknowledge peppermint oil, with ACG conditional/low-quality, BSG weak/very-low-quality, Polish strong/moderate-quality, and JSGE weak/high-quality recommendations for adjunctive use.
- Iberogast (STW 5 and STW 5-II) showed clinical improvements: a 10-patient IBS bloating study found improved colonic gas tolerance (p = 0.035) and reduced gas-related symptoms (p = 0.016); a 418-pediatric-patient observational study reported GIS improvement (p < 0.0001) with 0.7% adverse events; and a 2004 multicenter RCT (n = 51 STW 5, n = 52 STW 5-II, n = 52 placebo) modestly reduced abdominal pain (p = 0.0009 and p = 0.0005) and IBS symptom scores (p = 0.001 and p = 0.0003). Mexican and German guidelines mention STW-5 with low-quality evidence, while the Saudi CHI concluded insufficient evidence.
- Curcumin/turmeric showed mechanistic and preliminary clinical potential, with a meta-analysis of 551 adults reporting improved quality of life and reduced IBS-SSS and abdominal pain, though many included studies had methodological limitations. TCM trials reported benefit: JCM-16021 in two multicenter RCTs of 392 participants alleviated IBS-D abdominal pain; Tong-Xie-Yao-Fang in 160 adults was more effective than placebo for IBS-D; and XSLJZT in 80 IBS patients improved GI symptoms and quality of life in IBS-D. Kampo is recommended by the Japanese Society of Gastroenterology and the Second Asian Consensus but has not been studied in Western populations.
- Several extracts showed controversial or no efficacy: soy flavonoids in 67 IBS patients reduced IBS-QoL (p = 0.009) but not IBS-SSS (p = 0.068); Aloe vera meta-analysis of 151 patients found improvement (SMD 0.41; 95% CI 0.07–0.75; p = 0.020), but another meta-analysis of 3 RCTs found no improvement (p = 0.12, p = 0.09, p > 0.05); St John’s wort reduced symptoms in 20 women (p < 0.01) but a 12-week trial showed lower efficacy than placebo (p = 0.03); ginger alone in 45 IBS patients showed no significant improvement (p > 0.05); Curcuma xanthorriza pain increased versus placebo (p = 0.81); Fumaria officinalis abdominal distension increased in the treatment group (p = 0.48); and an Ayurvedic compound showed no greater improvement than placebo in IBS-D.
Methods
- Narrative review aiming to summarize, compare, and critically evaluate all plant extracts studied for IBS prevention and management, integrating mechanistic pathways, clinical evidence, and international guideline recommendations.
- Evidence base included clinical trials, systematic reviews and meta-analyses, preclinical studies, and international guidelines from ACG, CAG, Mexican, BSG, UEG/ESNM, DGVS/DGNM, Polish, Asian, JSGE, Korean, Saudi CHI, and ESPGHAN/NASPGHAN.
- Main analysis was a narrative synthesis of selected trial outcomes, mechanistic findings, and guideline recommendations; no systematic search strategy, eligibility criteria, or formal risk-of-bias assessment is described in the text.
Limitations
- Stated: significant heterogeneity among herbal preparations—plant species, extraction techniques, standardization, and dosing regimens—limits direct comparisons across studies.
- Stated: quality of evidence for many extracts remains low due to small sample sizes, short study durations, or methodological problems; much mechanistic evidence derives from preclinical models that may not fully explain human IBS.
- Evident from the text: as a narrative review, it lacks a described systematic search, formal risk-of-bias assessment, or quantitative synthesis; guideline comparisons are limited by differing grading systems, with some recommendations not using GRADE. The text also notes that sex-stratified efficacy results were not reported across peppermint oil studies and that pediatric populations remain understudied.
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In the paper
“Clinical trials conducted before the Rome IV criteria showed that a 4-week treatment with peppermint oil (two capsules twice daily) improved IBS abdominal symptoms compared with placebo (p < 0.009) in a prospective double blind randomized controlled trial [29]”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > 2. Effective Plant Extracts in Irritable Bowel Syndrome Management > 2.1. Peppermint Oil
What the sources say
- Not checked yetcites [29] Cappello, 2007, Peppermint oil (Mintoil) in the treatment of irritable bowel syndrome: A prospective double blind placebo-controlled randomized trial, Dig. Liver Dis. source
plainstates a cause- Asserted: passes — The authors put it forward as true.
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In the paper
“extracts such as Curcuma xanthorrhiza, Fumaria officinalis, and various Ayurvedic formulations have not shown significant clinical benefit”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > Abstract
What the sources say
- Not checked yetcites [87] Lauche, 2016, Efficacy and safety of Ayurvedic herbs in diarrhoea-predominant irritable bowel syndrome: A randomised controlled crossover trial, Complement. Ther. Med. source
plain- Asserted: passes — The authors put it forward as true.
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None of the sources cited for this claim have been checked yet.
In the paper
“Iberogast (STW-5 and STW-5 II) has also demonstrated clinical improvements across multiple trials”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > Abstract
What the sources say
- Not checked yetcites [43] Aguilar, 2024, Effect of Iberogast (STW5) on tolerance to colonic gas in patients with irritable bowel syndrome: A randomized, double-blind, placebo control clinical trial, Neurogastroenterol. Motil. source
- Not checked yetcites [44] Michael, 2022, Functional gastrointestinal disorders in children: Effectivity, safety, and tolerability of the herbal preparation STW-5 (Iberogast®) in general practice, Complement. Ther. Med. source
- Not checked yetcites [45] Madisch, 2004, Treatment of irritable bowel syndrome with herbal preparations: Results of a double-blind, randomized, placebo-controlled, multi-centre trial, Aliment. Pharmacol. Ther. source
boostedstates a cause- Asserted: passes — The authors put it forward as true.
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In the paper
“extracts such as Curcuma xanthorrhiza, Fumaria officinalis, and various Ayurvedic formulations have not shown significant clinical benefit”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > Abstract
What the sources say
- Not checked yetcites [86] Brinkhaus, 2005, Herbal medicine with curcuma and fumitory in the treatment of irritable bowel syndrome: A randomized, placebo-controlled, double-blind clinical trial, Scand. J. Gastroenterol. source
plain- Asserted: passes — The authors put it forward as true.
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In the paper
“and an 8-week treatment (one capsule three times daily) reduced abdominal pain or discomfort compared with placebo (p < 0.001) in a randomized double-blind placebo-controlled study with 90 participants [30]”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > 2. Effective Plant Extracts in Irritable Bowel Syndrome Management > 2.1. Peppermint Oil
What the sources say
- Not checked yetcites [30] Merat, 2010, The effect of enteric-coated, delayed-release peppermint oil on irritable bowel syndrome, Dig. Dis. Sci. source
plainstates a causen = 90- Asserted: passes — The authors put it forward as true.
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In the paper
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > 2. Effective Plant Extracts in Irritable Bowel Syndrome Management > 2.4. Traditional Chinese Medicine (TCM)
“Panax ginseng (ginger root), Pinellia ternata (Pinellia tuber), Poria cocos (Poria mushroom), Zingiber officinale (ginseng)”
§ Plant-Derived Treatments for IBS: Clinical Outcomes, Mechanistic Insights, and Their Position in International Guidelines > 3. Plant Extracts with Controversial Results > 3.4. Ginger (Zingiber officinale)
“Ginger is derived from the rhizome of Zingiber officinale”
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Cited by
Pathophysiology-driven use of natural products in irritable bowel syndrome: a review
Mohamed, F. A., Hassan, M.-A. M., Aboulmagd, Y. M., Attallah, K. A., Ghaiad, H. R., El‐Shiekh, R. A., & Fahmy, M. I. (2026) · Naunyn-Schmiedeberg s Archives of Pharmacology · doi:10.1007/s00210-026-05337-2
Metadata
- Authors
- Pastras, P., Aggeletopoulou, I., Bali, M., & Triantos, C.
- Affiliations
- University of Patras (GR)
- Corresponding author
- Aggeletopoulou, Ioanna
- Venue
- Nutrients
- Publisher
- MDPI AG
- Published
- 2026-01-06
- Volume
- 18
- Issue
- 2
- Pages
- 183
- ISSN
- 2072-6643 (ISSN-L)
- PMC
- PMC12845297
- OpenAlex
- W7118421589
- Cited by
- 1
- References
- 95
- Citations by year
- 2026: 1
- FWCI
- 0.84
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Nutrients (publishedVersion, cc-by)
- PubMed (publishedVersion)
- PubMed Central (publishedVersion, cc-by)
- Topics
- Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
- Health Sciences › Medicine › Complementary and alternative medicine › Complementary and Alternative Medicine Studies
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
- Keywords
- irritable bowel syndrome, botanical medicine, peppermint oil, Iberogast, curcumin, Curcuma xanthorrhiza, fumitory, Ayurvedic formulation, Aloe vera, flavonoids, Hypericum perforatum, ginger, abdominal pain, symptom severity, mechanistic pathways, clinical guidelines, complementary therapy
- MeSH terms
- Humans, Phytotherapy, Plant Extracts, Plant Oils, Treatment Outcome, Practice Guidelines as Topic, Mentha piperita, Irritable Bowel Syndrome
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