Partially Hydrolyzed Guar Gum (PHGG)
A unique, non-thickening soluble fiber for constipation, diarrhea, and SIBO.
Also known as: PHGG • Sunfiber
Overview
Partially Hydrolyzed Guar Gum (PHGG) is a unique soluble, prebiotic fiber derived from the guar bean. Unlike regular guar gum, which is very thick, PHGG is treated with enzymes that break it down into smaller units. This allows it to dissolve completely in water without becoming thick or gritty. It is exceptionally well-tolerated and has been shown to improve both constipation and diarrhea. As a prebiotic, it is fermented slowly in the colon, producing minimal gas and bloating, and is even suitable for many people with IBS and SIBO.
Key Benefits
Improves Constipation
Softens stool and promotes regularity without causing urgency.
Helps with Diarrhea
Absorbs excess water in the colon to help firm up loose stools.
SIBO-Friendly Prebiotic
It is fermented slowly, making it one of the few prebiotics often recommended for people with SIBO to help restore regularity.
Dosage & How to Take
5-10 grams per day.
| Purpose | Dose | Notes |
|---|---|---|
| Bowel regularity | 5 grams/day | Dissolve in any non-carbonated beverage. |
| IBS/SIBO | 5-7 grams/day | Start with a half scoop (2.5g) and increase slowly. |
Best Time to Take
Can be taken anytime.
With or Without Food
Can be mixed into any food or beverage.
Forms & Bioavailability
| Form | Absorption | Best For | Notes |
|---|---|---|---|
| Powder | N/A (local effect) | All uses | Look for brands that are 100% PHGG, like Sunfiber. |
Side Effects & Safety
Common
- Extremely well-tolerated; minimal gas or bloating
Rare
- None known
Contraindications
- None known
Interactions
PHGG is a very safe fiber with no known drug interactions.
Scientific Research
PHGG in IBS
A randomized trial found that PHGG significantly improved quality of life and symptoms in patients with constipation-predominant IBS.
Food Sources
Frequently Asked Questions
Medical Disclaimer
This content is for educational and informational purposes only and is not intended as medical advice. Always consult with a qualified healthcare professional before starting any supplement regimen, especially if you have pre-existing health conditions or are taking medications. The statements on this page have not been evaluated by the Food and Drug Administration.