What is the recommended dosage for Partially Hydrolyzed Guar Gum (PHGG)?

General: 5-7 g/day; Ibs Support: 5 g/day for 4-12 weeks; Sibo Adjunct: 5 g/day alongside antimicrobial therapy

What are the side effects of Partially Hydrolyzed Guar Gum (PHGG)?

Potential side effects include: Minimal gas and bloating (significantly less than other fibers), Mild abdominal discomfort in rare cases, Loose stools at very high doses.

What is partially hydrolyzed guar gum (PHGG) and how does it work for gut health?

Partially hydrolyzed guar gum is a water-soluble prebiotic fiber derived from guar beans through enzymatic hydrolysis. Unlike regular guar gum, PHGG dissolves completely without thickening, making it easy to add to beverages. Research suggests it may help regulate bowel movements in both constipation and diarrhea, support beneficial bacteria growth, and increase short-chain fatty acid production in the colon.

What is the recommended dosage of PHGG?

Clinical studies have used PHGG at 5-10 g per day, with 5 g being the most commonly studied effective dose. The brand Sunfiber is the most widely researched PHGG product. It can be dissolved in any liquid (hot or cold) without affecting taste or texture. Benefits are typically observed after 1-4 weeks of consistent daily use.

Are there side effects or interactions with PHGG?

PHGG is one of the best-tolerated prebiotic fibers, causing significantly less gas and bloating compared to FOS or inulin. It is classified as a low-FODMAP fiber, making it suitable for many individuals with IBS. No significant drug interactions are known, though as with any fiber supplement, it may affect the absorption of medications taken at the same time.

Partially Hydrolyzed Guar Gum (PHGG)

fiber

Also known as: PHGG, Sunfiber, Taiyo's PHGG, Benefiber

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About

Partially hydrolyzed guar gum (PHGG) is a water-soluble, non-gelling fiber that is exceptionally well-tolerated compared to other fiber supplements. Research suggests it may help normalize both constipation and diarrhea, making it uniquely suited for mixed bowel habit conditions. PHGG supports the growth of Bifidobacterium and Lactobacillus species and is fermented primarily to butyrate without causing the excess gas associated with many other fibers.

How It Works

Water-soluble non-gelling fiber fermented to butyrate in the colon; normalizes both constipation and diarrhea (bidirectional regulatory effect); supports Bifidobacterium and Lactobacillus growth without causing excess gas; low viscosity helps reduce the bloating common with other fiber supplements.

Evidence For Conditions

Condition	Grade	Studies	Participants
Irritable Bowel Syndrome (IBS)	B	5	350	View →
Small Intestinal Bacterial Overgrowth (SIBO)	C	2	100	View →

Side Effects

Minimal gas and bloating (significantly less than other fibers)
Mild abdominal discomfort in rare cases
Loose stools at very high doses

Drug & Supplement Interactions

May slow absorption of some medications (space 1-2 hours)
Diabetes medications (may modestly affect blood glucose)

Always inform your healthcare provider about all supplements you take.

Related Ingredients

Psyllium Husk

Quick Facts

Dosage: General: 5-7 g/day; Ibs_Support: 5 g/day for 4-12 weeks; Sibo_Adjunct: 5 g/day alongside antimicrobial therapy
Forms: powder capsule
Natural Sources: Derived from guar gum (Cyamopsis tetragonoloba, a legume plant), Available as processed supplement
Upper Limit: Well-tolerated up to 36 g/day in clinical trials
Best Time: Mixed into food or beverages; dissolves completely without altering texture

Evidence Summary

Irritable Bowel Syndrome (IBS) B

Small Intestinal Bacterial Overgrowth (SIBO) C

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.