PHGG | Research and limitations

1 detailed study records

Key findings from detailed records

Population: 121 IBS patients randomized; 108 included in the intention-to-treat analysis Findings: Bloating and a score including gas improved. Overall severity, quality of life and some other measures did not improve significantly.

Edited by LÍFSVARÐASources reviewed: 2026-09-21Updated: 2026-10-24Estimated reading time: 6 min

KNOWLEDGE RECORD

Category: Gut health and dietary fiber
Last Reviewed: 2026-09-21

Names and related search termsPHGG / Partially hydrolyzed guar gum / PHGG / Partially hydrolyzed guar gum

Study type: human intervention study.

Explore 10 papers by research question ↓

OUTCOME-SPECIFIC EVIDENCE

Scientific Evidence Profile

Assessment pending

An outcome-specific assessment has not yet been completed. This is not a finding that the ingredient is ineffective. The study records below remain available.

This profile concerns the stated outcome and population, not the ingredient as a whole. It is not a probability of benefit, a safety rating, a product efficacy rating or an indication of product adoption.

How we assess evidence

Ingredient Profile

What material is being studied?: PHGG is guar gum with some of its long carbohydrate chains broken down by enzymes. The processing step matters: partially hydrolyzed guar gum is not the same material as untreated guar gum. [1]

Sources for this profile

Compound properties and formulation properties are different. These sources do not establish the efficacy of a finished supplement.

Cross-linked β-Mannanase Aggregates: Preparation, Characterization, and Application for Producing Partially Hydrolyzed Guar Gum Identity and preparation checked against the study abstract. Funding details are not verified for this profile source. Conflict-of-interest details are not verified here.

Profile sources checked: 2026-10-11

Read the evidence in context

Evidence: what was measured in the stated population or experimental model.
Inference: an interpretation connecting findings; its applicability depends on the study conditions.
Hypothesis: a proposed explanation or effect that remains to be tested.

Research Evidence · Scientific Synthesis

Why It Matters #

Is improvement in bloating the same as overall improvement in IBS? Check the detailed records for study conditions and use the literature map to compare other populations and outcomes.

What Was Studied #

121 IBS patients randomized; 108 included in the intention-to-treat analysis Randomized, double-blind, placebo-controlled trial. Outcomes: Symptom diaries, IBS severity and quality of life[1]

What Was Found #

Bloating and a score including gas improved. Overall severity, quality of life and some other measures did not improve significantly.[1]

What the Evidence Means #

Findings varied by symptom, and dropout rates differed between groups. The study does not establish efficacy for every IBS symptom.[1]

Comparing similar populations, formulations, durations and outcomes helps identify where findings agree and where they differ.

What We Can Learn #

Break “good for the gut” down into which fiber was tested for which symptoms.

What Remains Unknown #

Further questions include reproducibility across populations and formulations, and the long-term balance of benefits and harms. Use the literature map as a starting point for these questions.

LITERATURE MAP / 10 PAPERS

Compare papers by conditions and findings.

A literature map covering different populations, outcomes and formulations. Read alongside detailed records to avoid treating one trial as the conclusion for an entire ingredient.

Selected: 2026-09-21. Bibliographic information checked against Europe PMC / PubMed. Editorial selection considered major papers and a range of populations and questions. This is not a systematic search covering all recent research.

10 RECORDS

A dash marks fields outside the bibliographic record. Use detailed records to compare findings and design records to connect mechanisms.

Research comparison table
Paper and topic	Study conditions	Findings and scope
Gut health and digestionRandomized clinical study: Partially hydrolyzed guar gum (PHGG) versus placebo in the treatment of patients with irritable bowel syndrome.2016 Nutrition & metabolismPMID 26855665 #	Study conditions Randomized, double-blind, placebo-controlled trial Population 121 randomized; 13 left during run-in. The study’s intention-to-treat set included 108 who started treatment (49 PHGG, 59 placebo); 68 completed treatment. Dose PHGG 6 g/day Duration 12-week intervention plus 4-week follow-up, with a 2-week run-in Outcomes Symptom diaries, IBS severity and quality of life	Findings and scope Bloating and a score including gas improved. Overall severity, quality of life and some other measures did not improve significantly. View findings and limitations DOI Authors Niv E, Halak A, Tiommny E, Yanai H, Strul H, Naftali T et al.
Partially hydrolyzed guar gum in pediatric functional abdominal pain.2013 World journal of gastroenterologyPMID 23345946 #	Study conditions —	Findings and scope — Open original paper DOI Authors Romano C, Comito D, Famiani A, Calamarà S, Loddo I
Effects of a partially hydrolyzed guar gum on intestinal absorption of carbohydrate, protein and fat: a double-blind controlled study in volunteers.1998 Clinical nutrition (Edinburgh, Scotland)PMID 10205329 #	Study conditions —	Findings and scope — Open original paper DOI Authors Alam NH, Meier R, Rausch T, Meyer-Wyss B, Hildebrand P, Schneider H et al.
Effectiveness of Partially Hydrolyzed Guar Gum on Cognitive Function and Sleep Efficiency in Healthy Elderly Subjects in a Randomized, Double-Blind, Placebo-Controlled, and Parallel-Group Study.2024 NutrientsPMID 38674901 #	Study conditions —	Findings and scope — Open original paper DOI Authors Abe A, Kapoor MP, Morishima S, Ozeki M, Sato N, Takara T et al.
Dietary intervention of prebiotic partially hydrolyzed guar gum improves skin viscoelasticity, stratum corneum hydration, and reduction of trans-epidermal water loss: a randomized, double-blind, and placebo-controlled clinical study in healthy humans.2025 Journal of clinical biochemistry and nutritionPMID 39896159 #	Study conditions —	Findings and scope — Open original paper DOI Authors Kapoor MP, Abe A, Morishima S, Nakajima A, Ozeki M, Sato N
Continuous partially hydrolyzed guar gum intake reduces cold-like symptoms: a randomized, placebo-controlled, double-blinded trial in healthy adults.2022 European review for medical and pharmacological sciencesPMID 35916813 #	Study conditions —	Findings and scope — Open original paper DOI Authors Sakai S, Kamada Y, Takano H, Ichikawa M, Kurimoto M, Katsuyama HK et al.
Tolerability and efficacy of an enteral formula containing partially hydrolyzed guar gum in patients following gastrointestinal surgery: A prospective, multicenter, open-label, randomized controlled study.2026 Clinical nutrition (Edinburgh, Scotland)PMID 41483486 #	Study conditions —	Findings and scope — Open original paper DOI Authors Han T, Zhuo J, Wu X, Chi Q, Chen B, Chen J et al.
Effect of Repeated Consumption of Partially Hydrolyzed Guar Gum on Fecal Characteristics and Gut Microbiota: A Randomized, Double-Blind, Placebo-Controlled, and Parallel-Group Clinical Trial.2019 NutrientsPMID 31509971 #	Study conditions —	Findings and scope — Open original paper DOI Authors Yasukawa Z, Inoue R, Ozeki M, Okubo T, Takagi T, Honda A et al.
Efficacy of partially hydrolyzed guar gum-added oral rehydration solution in the treatment of severe cholera in adults.2008 DigestionPMID 18769066 #	Study conditions —	Findings and scope — Open original paper DOI Authors Alam NH, Ashraf H, Sarker SA, Olesen M, Troup J, Salam MA et al.
Partially hydrolyzed guar gum-supplemented oral rehydration solution in the treatment of acute diarrhea in children.2000 Journal of pediatric gastroenterology and nutritionPMID 11144434 #	Study conditions —	Findings and scope — Open original paper DOI Authors Alam NH, Meier R, Schneider H, Sarker SA, Bardhan PK, Mahalanabis D et al.

The literature map is an index of research questions and references. Individual assessment of results, doses, funding and COI is limited to the detailed study records. Related reports from the same trial may be included; paper counts are not counts of independent trials.

Explore the research Study Records

Listed doses describe study conditions, not recommended intake.

Study RecordPMID 26855665

Randomized clinical study: Partially hydrolyzed guar gum (PHGG) versus placebo in the treatment of patients with irritable bowel syndrome.

PubMed 26855665 DOI: 10.1186/s12986-016-0070-5

Authors: Niv E, Halak A, Tiommny E, Yanai H, Strul H, Naftali T, Vaisman N.
Journal: Nutrition & metabolism
Publication year: 2016
Study design: Randomized, double-blind, placebo-controlled trial
Participants: 121 randomized; 13 left during run-in. The study’s intention-to-treat set included 108 who started treatment (49 PHGG, 59 placebo); 68 completed treatment.
Dose and intervention: PHGG 6 g/day
Duration: 12-week intervention plus 4-week follow-up, with a 2-week run-in
Outcomes and their role in the study: Symptom diaries, IBS severity and quality of life
Findings: Bloating and a score including gas improved. Overall severity, quality of life and some other measures did not improve significantly.
Limitations: Treatment dropouts were 11/49 with PHGG and 29/59 with placebo. Baseline symptoms differed, and only 41 completed the later follow-up. Mild gastrointestinal symptoms were reported in 9 participants per arm; attribution was uncertain. Benefits were symptom-specific.
Funding: Supported by Pro Natura and Sunwic AB. The paper states that study design and conduct were independent.
Conflict of Interest: The authors declared no competing interests. Corporate funding is recorded separately.
Scope of source review: Primary-paper methods, relevant results, limitations and funding/COI checked on 2026-10-24. This record assesses the stated claims, not every analysis in the paper.

Cite this page

LÍFSVARÐA. PHGG: Is improvement in bloating the same as overall improvement in IBS? Version 1.1 / Updated 2026-10-24

https://lifsvarda.com/knowledge/phgg/

Edited by LÍFSVARÐA (product brand).Editorial policy

Sources and updates

Niv E, Halak A, Tiommny E, Yanai H, Strul H, Naftali T, Vaisman N. (2016). Randomized clinical study: Partially hydrolyzed guar gum (PHGG) versus placebo in the treatment of patients with irritable bowel syndrome.Primary-paper methods, relevant results, limitations and funding/COI checked on 2026-10-24. This record assesses the stated claims, not every analysis in the paper.

First published: 2026-09-21 / Version 1.1. Updated 2026-09-23: Added a research comparison table and links to design records. Source notes identify the scope of verification when the full paper has not been reviewed. Research summaries and LÍFSVARÐA’s interpretation are distinguished.

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