Partially Hydrolyzed Guar Gum (PHGG)
Commonly used for
Digestive HealthNutrition
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What is it? / Overview
PHGG is a soluble, non-gelling, fermentable fiber. In the colon it's fermented to short-chain fatty acids and increases beneficial bacteria (a prebiotic effect) while normalizing transit -- softening and accelerating stool in constipation and reducing bloating in IBS, with dropout rates in trials actually lower than placebo.
How is it used? / Administration
Form: Water-soluble, non-gelling fermentable fiber (e.g. Sunfiber brand)
Typical dose studied: 5-6 g/day
Timing: Once daily, mixed into food or liquid; start low to limit gas
As with all fibers, take with adequate fluid and introduce gradually; caution in swallowing disorders or bowel obstruction/stricture applies to fiber supplements generally.
How well does it work? / Evidence
~ Moderate evidence
Who should avoid it?
Avoid with: Dysphagia / Difficulty swallowing
Interacts with: Oral medications generally -- soluble fiber may modestly slow absorption; separate dosing
Already taking it? Reasonable to continue -- this is the best-supported item in this batch, with a lower gas/bloating profile than inulin-type fibers.
Research & references
Niv E et al. (2016). Partially Hydrolyzed Guar Gum in the Treatment of Irritable Bowel Syndrome. Nutrition & Metabolism. Polymeros D et al. (2014). Partially Hydrolyzed Guar Gum Accelerates Colonic Transit Time and Improves Symptoms in Adults With Chronic Constipation. Digestive Diseases and Sciences. Giannini EG et al. (2006). Role of Partially Hydrolyzed Guar Gum in the Treatment of Irritable Bowel Syndrome. Nutrition.
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