Compound or practice · Nutrition
Partially Hydrolyzed Guar Gum (PHGG)
A gentle, well-tolerated soluble fiber that helps both constipation and diarrhea — the low-FODMAP-friendly fiber for IBS.
- Overall grade
- Grade B
- Last revised
- 2
- graded outcomes
- 0
- references listed
A structured monograph in Prometheus's bundled library. Its grades are the monograph's own reading of the evidence, not a peer-reviewed review.
2 at grade B — 2 graded rows
What is known
Each outcome with its grade (how strong the evidence is, A to D), the size of the effect where the entry records one, and how often studies agree.
- IBS symptomsEvidence grade B
Both IBS-C and IBS-D
Moderatemixed
- RegularityEvidence grade B
Normalizes stool
Moderatehigh
What is uncertain
Read off the same rows as above. Nothing here is added that the entry does not itself record.
- Studies disagree: IBS symptoms (mixed agreement).
Interactions
Documented pairings with supplements and medicines. A medicine on this list is a conversation for whoever prescribes it.
Psyllium HuskWorks together
Complementary soluble fibers; PHGG is gentler on gas.
The evidence in words
What it is
PHGG is a soluble, low-viscosity fiber (e.g. Sunfiber) made by breaking down guar gum, used for gut regularity and IBS.
How it works
It ferments to short-chain fatty acids feeding the microbiome, normalizes stool water content, and — unusually — helps both loose and hard stool.
What the evidence shows
Trials support PHGG for improving IBS symptoms (both constipation- and diarrhea-predominant), regularity, and as a prebiotic, with excellent tolerability and minimal gas versus inulin. It's low-FODMAP, making it IBS-friendly.
Safety & interactions
Very well tolerated — one of the gentlest fibers; introduce gradually. Psyllium Husk — Complementary soluble fibers; PHGG is gentler on gas.
Bottom line
A standout tolerable soluble fiber for IBS and regularity that works in both directions and causes little bloating. A great first fiber to try.
Goes with
- Psyllium HuskComplementary soluble fibers; PHGG is gentler on gas.Evidence grade A
Related reading
Entries that share this one's tags or conditions.
- Partially Hydrolyzed Guar Gum (PHGG) for RegularityEvidence grade B — Normalizes stoolEvidence grade B
- Partially Hydrolyzed Guar Gum (PHGG) for IBS symptomsEvidence grade B — Both IBS-C and IBS-DEvidence grade B
- Partially Hydrolyzed Guar Gum (PHGG): side effects, safety & interactionsVery well tolerated — one of the gentlest fibers; introduce gradually.Evidence grade B
- Larch ArabinogalactanA larch-tree prebiotic fiber with modest immune and gut signals — well tolerated, lightly evidenced.Evidence grade C
Sources
This entry lists no references of its own.
Last revised . A grade is this entry's reading of the evidence, not medical advice.