Pg8.5

PHGG

botanical

Partially Hydrolyzed Guar Gum

Low-viscosity prebiotic fiber that feeds beneficial gut bacteria and improves IBS and SIBO symptoms without bloating.

bodygut healthfiberprebioticIBS

25+ studies

Evidence

Reviewed 19 days ago

high

Safety

5-6g daily

Dose

2-8 weeks

Time to Effect

PHGG powder (Sunfiber is common brand)

Best Form

Partially Hydrolyzed Guar Gum (PHGG) is a water-soluble fiber derived from guar beans. Unlike regular guar gum, it's been processed to reduce its viscosity, making it much easier to digest and less likely to cause bloating. It acts as a prebiotic, feeding beneficial gut bacteria. It's particularly useful for IBS, SIBO, and improving regularity without the discomfort of other fibers.

Mechanisms of Action

🦠

Prebiotic Action

Feeds beneficial gut bacteria

💧

Gentle Bulk-Forming

Adds bulk to stool without excessive gas

⚡

SCFA Production

Produces beneficial short-chain fatty acids

Biological PathwayBeta

How PHGG works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.

Recommended Dose

5-6g daily

3g10g

Loading: Start with 3g and increase gradually to minimize gas

Optimal Timing

With meals
Can be added to drinks or food

Take with food

Available Forms

Form	Type
🧪PHGG powder (Sunfiber is common brand)	Recommended
💊Capsules (but need many for effective dose)	Alternative

Powder is most practical due to the dose needed. Dissolves completely with no gelling.

Duration

Minimum: 2 weeks

Optimal: 8 weeks

Cycling: Not required

Note: Very mild, dissolves clear, and has minimal taste. Can be added to water, smoothies, or food.

✓

Improved Regularity

More consistent bowel movements

⏱️ 1-2 weeks

75% of users notice thispositive

😌

IBS Symptom Relief

Reduced IBS symptoms including bloating

⏱️ 2-4 weeks

65% of users notice thispositive

🦠

Microbiome Support

Increased beneficial bacteria

⏱️ 2-4 weeks

70% of users notice thispositive

High SafetyMax safe dose: 10g/day commonly used

🟡

Those with SIBO

One of the few fibers often tolerated in SIBO

Who Should NOT Take This

Known allergy or hypersensitivity to PHGG or related compounds

Drug Interactions

Oral medicationsmild

May slow absorption; take medications separately

Possible Side Effects

Initial gas

milduncommon

Tip: Start low and increase gradually

Warnings

Start with lower dose to assess tolerance
Drink adequate water with fiber

⟡ Probiotics

complementary

Prebiotic feeds the probiotic bacteria

Enhanced microbiome support

Top studies from 25+ peer-reviewed papers

📊rctn=631

DOI

Han T et al. • Clinical nutrition (Edinburgh, Scotland) (2026)

“The PHGG-enriched enteral nutrition formulation is well-tolerated and non-inferior to a fiber-free formula among patients following GI surgery.”

Key Findings:

The incidence of diarrhea was 9.6 % (95 % confidence interval [CI]: 6.3 to 12.8) in the experimental group and 10.1 % (95 % CI: 6.8 to 13.4) in the control group, with an absolute difference of -0.5 (95 % CI: -5.1 to 4.2) confirming non-inferiority (P < 0.001).
In patients who consumed ≥4500 kcal over 5 days (averaging 900 kcal/day), the experimental group showed significantly improved feeding tolerance, with a reduced prevalence of diarrhea and abdominal distension (10.4 % vs 24.7 %, P = 0.045; 19.4 % vs 38.4 %, P = 0.016).
Patients with gastric cancer in the experimental group had significantly less abdominal distension (22.7 % vs 48.8 %; P = 0.014).
Regarding weight preservation, the experimental group demonstrated benefits in weight preservation at discharge (%weight change: -1.39 vs -2.33, P = 0.049).

📊rct

DOI

Abe A et al. • Nutrients (2024)

“In summary, supplementation with PHGG was effective in improving cognitive functions, particularly visual memory, as well as enhancing sleep quality and vitality in healthy elderly individuals (UMIN000049070).”

Key Findings:

The visual memory scores in cognitive function tests and sleepiness on rising scores related to sleep quality were significantly improved in the PHGG group compared to the placebo group.
Vigor-activity scores were significantly improved, while the scores for Confusion-Bewilderment decreased significantly in the PHGG group when compared to the baseline.
No significant differences were observed in mood parameters between the groups.
In summary, supplementation with PHGG was effective in improving cognitive functions, particularly visual memory, as well as enhancing sleep quality and vitality in healthy elderly individuals (UMIN000049070).

📊rctn=96

DOI

Sakai S et al. • European review for medical and pharmacological sciences (2022)

“PHGG intake may affect immune function and suppress cold-like symptoms through the production of SCFAs in healthy adults.”

Key Findings:

PHGG intake may affect immune function and suppress cold-like symptoms through the production of SCFAs in healthy adults.
Further research warranted to confirm findings

📊rctn=20

DOI

Reider SJ et al. • Nutrients (2020)

“The majority of effects disappeared after stopping the prebiotic and most effects tended to be more pronounced in male participants. (4) Conclusions: Herein, we describe novel aspects of the prebiotic PHGG on compositional and functional properties of the healthy human microbiota.”

Key Findings:

To gain functional insight, we further studied stool metabolites using nuclear magnetic resonance (NMR) spectroscopy. (3) Results: In healthy subjects, PHGG had significant effects on stool frequency and consistency.
These effects were paralleled by changes in α- (species evenness) and β-diversity (Bray-Curtis distances), along with increasing abundances of metabolites including butyrate, acetate and various amino acids.
On a taxonomic level, PHGG intake was associated with a bloom in Ruminococcus, Fusicatenibacter, Faecalibacterium and Bacteroides and a reduction in Roseburia, Lachnospiracea and Blautia.
The majority of effects disappeared after stopping the prebiotic and most effects tended to be more pronounced in male participants. (4) Conclusions: Herein, we describe novel aspects of the prebiotic PHGG on compositional and functional properties of the healthy human microbiota.

📊rctn=17

DOI

Zhao W et al. • Nutrients (2020)

“The combination of HG and HP as double preload resulted in better GR than both single HG or HP preload did.”

Key Findings:

Co-preload of partial hydrolyzed guar gum and highly cooked potato (PHG + PHP + R) resulted in improved acute GR in terms of peak glucose value and glycemic excursion compared with either HG preload or HP preload.
All the meals with preload showed comparable or improved self-reported satiety.
Within an equicarbohydrate exchange framework, both high-GI and medium-GI potato preload decreased the postprandial glycemic excursion in young healthy female subjects.
The combination of HG and HP as double preload resulted in better GR than both single HG or HP preload did.

View all 25+ studies

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Pg8.5

PHGG

botanical

Partially Hydrolyzed Guar Gum

Low-viscosity prebiotic fiber that feeds beneficial gut bacteria and improves IBS and SIBO symptoms without bloating.

bodygut healthfiberprebioticIBS

25+ studies

Evidence

Reviewed 19 days ago

high

Safety

5-6g daily

Dose

2-8 weeks

Time to Effect

PHGG powder (Sunfiber is common brand)

Best Form

Mechanisms of Action

🦠

Prebiotic Action

Feeds beneficial gut bacteria

💧

Gentle Bulk-Forming

Adds bulk to stool without excessive gas

⚡

SCFA Production

Produces beneficial short-chain fatty acids

Biological PathwayBeta

How PHGG works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.

Supplement

Molecular Target

Biological Process

Health Outcome

Strong

Moderate

Emerging

strong

moderate

emerging

Tap node to isolate • Pinch to zoom • Tap edge for research

Recommended Dose

5-6g daily

3g10g

Loading: Start with 3g and increase gradually to minimize gas

Optimal Timing

With meals
Can be added to drinks or food

Take with food

Available Forms

Form	Type
🧪PHGG powder (Sunfiber is common brand)	Recommended
💊Capsules (but need many for effective dose)	Alternative

Powder is most practical due to the dose needed. Dissolves completely with no gelling.

Duration

Minimum: 2 weeks

Optimal: 8 weeks

Cycling: Not required

Note: Very mild, dissolves clear, and has minimal taste. Can be added to water, smoothies, or food.

✓

Improved Regularity

More consistent bowel movements

⏱️ 1-2 weeks

75% of users notice thispositive

😌

IBS Symptom Relief

Reduced IBS symptoms including bloating

⏱️ 2-4 weeks

65% of users notice thispositive

🦠

Microbiome Support

Increased beneficial bacteria

⏱️ 2-4 weeks

70% of users notice thispositive

High SafetyMax safe dose: 10g/day commonly used

🟡

Those with SIBO

One of the few fibers often tolerated in SIBO

Who Should NOT Take This

Known allergy or hypersensitivity to PHGG or related compounds

Drug Interactions

Oral medicationsmild

May slow absorption; take medications separately

Possible Side Effects

Initial gas

milduncommon

Tip: Start low and increase gradually

Warnings

Start with lower dose to assess tolerance
Drink adequate water with fiber

⟡ Probiotics

complementary

Prebiotic feeds the probiotic bacteria

Enhanced microbiome support

Top studies from 25+ peer-reviewed papers

📊rctn=631

DOI

Han T et al. • Clinical nutrition (Edinburgh, Scotland) (2026)

“The PHGG-enriched enteral nutrition formulation is well-tolerated and non-inferior to a fiber-free formula among patients following GI surgery.”

Key Findings:

The incidence of diarrhea was 9.6 % (95 % confidence interval [CI]: 6.3 to 12.8) in the experimental group and 10.1 % (95 % CI: 6.8 to 13.4) in the control group, with an absolute difference of -0.5 (95 % CI: -5.1 to 4.2) confirming non-inferiority (P < 0.001).
In patients who consumed ≥4500 kcal over 5 days (averaging 900 kcal/day), the experimental group showed significantly improved feeding tolerance, with a reduced prevalence of diarrhea and abdominal distension (10.4 % vs 24.7 %, P = 0.045; 19.4 % vs 38.4 %, P = 0.016).
Patients with gastric cancer in the experimental group had significantly less abdominal distension (22.7 % vs 48.8 %; P = 0.014).
Regarding weight preservation, the experimental group demonstrated benefits in weight preservation at discharge (%weight change: -1.39 vs -2.33, P = 0.049).

📊rct

DOI

Abe A et al. • Nutrients (2024)

“In summary, supplementation with PHGG was effective in improving cognitive functions, particularly visual memory, as well as enhancing sleep quality and vitality in healthy elderly individuals (UMIN000049070).”

Key Findings:

The visual memory scores in cognitive function tests and sleepiness on rising scores related to sleep quality were significantly improved in the PHGG group compared to the placebo group.
Vigor-activity scores were significantly improved, while the scores for Confusion-Bewilderment decreased significantly in the PHGG group when compared to the baseline.
No significant differences were observed in mood parameters between the groups.
In summary, supplementation with PHGG was effective in improving cognitive functions, particularly visual memory, as well as enhancing sleep quality and vitality in healthy elderly individuals (UMIN000049070).

📊rctn=96

DOI

Sakai S et al. • European review for medical and pharmacological sciences (2022)

“PHGG intake may affect immune function and suppress cold-like symptoms through the production of SCFAs in healthy adults.”

Key Findings:

PHGG intake may affect immune function and suppress cold-like symptoms through the production of SCFAs in healthy adults.
Further research warranted to confirm findings

📊rctn=20

DOI

Reider SJ et al. • Nutrients (2020)

“The majority of effects disappeared after stopping the prebiotic and most effects tended to be more pronounced in male participants. (4) Conclusions: Herein, we describe novel aspects of the prebiotic PHGG on compositional and functional properties of the healthy human microbiota.”

Key Findings:

To gain functional insight, we further studied stool metabolites using nuclear magnetic resonance (NMR) spectroscopy. (3) Results: In healthy subjects, PHGG had significant effects on stool frequency and consistency.
These effects were paralleled by changes in α- (species evenness) and β-diversity (Bray-Curtis distances), along with increasing abundances of metabolites including butyrate, acetate and various amino acids.
On a taxonomic level, PHGG intake was associated with a bloom in Ruminococcus, Fusicatenibacter, Faecalibacterium and Bacteroides and a reduction in Roseburia, Lachnospiracea and Blautia.
The majority of effects disappeared after stopping the prebiotic and most effects tended to be more pronounced in male participants. (4) Conclusions: Herein, we describe novel aspects of the prebiotic PHGG on compositional and functional properties of the healthy human microbiota.

📊rctn=17

DOI

Zhao W et al. • Nutrients (2020)

“The combination of HG and HP as double preload resulted in better GR than both single HG or HP preload did.”

Key Findings:

Co-preload of partial hydrolyzed guar gum and highly cooked potato (PHG + PHP + R) resulted in improved acute GR in terms of peak glucose value and glycemic excursion compared with either HG preload or HP preload.
All the meals with preload showed comparable or improved self-reported satiety.
Within an equicarbohydrate exchange framework, both high-GI and medium-GI potato preload decreased the postprandial glycemic excursion in young healthy female subjects.
The combination of HG and HP as double preload resulted in better GR than both single HG or HP preload did.

View all 25+ studies

What would you like to do next?

Compare with Others Find Based on Your Goals

Related Supplements

Ge9.0

Ginger Extract

9/10

Gingerols and shogaols reduce nausea, accelerate gastric emptying, and provide systemic anti-inflammatory benefits.

In9.0

Inulin

9/10

Prebiotic fiber that selectively feeds Bifidobacteria and Lactobacilli, producing short-chain fatty acids for gut health and immunity.

Rs9.0

Resistant Starch

9/10

Bypasses small intestine digestion to feed colon bacteria that produce butyrate — supports blood sugar, gut integrity, and metabolic health.

Ae8.5

Artichoke Extract

8.5/10

Cynarin and chlorogenic acid stimulate bile production, support liver function, and modestly lower cholesterol levels.