fiber Fiber Oral

Partially Hydrolyzed Guar Gum

A low-viscosity, soluble prebiotic fiber derived from guar beans, used to support gut health and improve bowel regularity.

Sci.Cyamopsis tetragonoloba (L.) Taub. Guar Fiber Hydrolyzed Guar Gum Sunfiber (branded form)
2 forms
Oral

About Partially Hydrolyzed Guar Gum

Partially Hydrolyzed Guar Gum (PHGG) is a water-soluble, non-gelling dietary fiber derived from the endosperm of guar beans (Cyamopsis tetragonoloba). Through controlled enzymatic hydrolysis, the high-molecular-weight galactomannan polysaccharide is broken down into smaller, low-viscosity fragments. This process improves its solubility and tolerability while retaining its prebiotic properties. It is clinically studied for its ability to modulate gut microbiota, improve bowel function, and manage symptoms of irritable bowel syndrome (IBS) and other functional gastrointestinal disorders.

Official resources

Fact sheets from the NIH Office of Dietary Supplements related to this ingredient group.

At a glance

Suggested daily

No established RDA. Clinical studies typically use doses of 5 to 15 grams per day, often starting at the lower end to assess tolerance.

Max safe daily

No established UL. Doses above 30 grams per day may increase the likelihood of gastrointestinal discomfort.

Approval status

GRAS (Generally Recognized as Safe) in the US as a food ingredient. Approved as a Novel Food in various jurisdictions.

Compare All Forms

2 forms

Compare supplement forms of Partially Hydrolyzed Guar Gum by absorption quality and what your body actually gets from each:

High Moderate Low
Form Absorption Steps to absorb Notes Action
Partially Hydrolyzed Guar Gum

Low-viscosity soluble prebiotic fiber; supports digestive he...

  • CAS: 9000-30-0 (for guar gum; specific CAS for hydrolyzed form may vary)
  • Label category: Natural (Guar)
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Partially Hydrolyzed Guar Gum (PHGG)

Soluble prebiotic fiber for digestive & gut health

  • UNII: P9758F4J5V
  • CAS: 9000-30-0
  • Label category: natural
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Also appears on labels as

Additional names seen on supplement labels for forms of this ingredient (beyond the main aliases above).

Low Molecular Weight Partially Hydrolyzed Guar Gum, PHGG, Soluble guar fiber, Sunfiber

Type: Fiber

Category for Fiber ingredients

Watch out for

Possible interactions or cautions — talk to a healthcare provider if unsure.

  • May slow gastric emptying and potentially affect absorption rate of some oral medications; standard advice is to take medications 1-2 hours apart from fiber supplements.

Potential Benefits

Benefits associated with Partially Hydrolyzed Guar Gum forms:

Gut Health Improves Gut Health & Prebiotic Effect Alleviates IBS Symptoms Relieves Functional Constipation Modulates Blood Glucose & Lipids Prebiotic Effect & Gut Microbiota Modulation

And 4 more benefits...

Potential Side Effects

Side effects associated with Partially Hydrolyzed Guar Gum forms:

Gas How serious: Mild Gastrointestinal Discomfort How serious: low Diarrhea or Loose Stools How serious: low Loose Stools or Diarrhea How serious: low

What does the research say?

Clinical research supports PHGG's role as a prebiotic that modulates gut microbiota, increasing beneficial Bifidobacteria and Lactobacilli. Multiple randomized controlled trials demonstrate efficacy in improving symptoms of irritable bowel syndrome (IBS), particularly in diarrhea-predominant and mixed-type IBS, by normalizing bowel habits and reducing abdominal discomfort. Studies also show benefit in managing functional constipation by increasing stool frequency and improving consistency with good tolerability. Evidence supports its use in managing mild to moderate ulcerative colitis symptoms and improving metabolic markers like blood lipids in some populations. It is generally well-tolerated with minimal gas production compared to other fermentable fibers.