Supplement Scholar
Compound

Partially Hydrolyzed Guar Gum (PHGG)

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Partially Hydrolyzed Guar Gum (PHGG). Soluble fiber for IBS and constipation.

How it works. Fermented to SCFAs without excessive gas.

What the research supports. 1 graded claims. Strongest: Improves IBS symptoms (moderate).

How much to take. Typical dose: 5 g/d.

Side effects and interactions. 1 medication interaction listed. No serious side effects listed at normal doses.

Stacking. Pairs well with Multi-strain probiotic, L-glutamine.

Common forms. Available as Capsule or softgel, Powder, Sublingual or buccal, Liposomal liquid.

Key studies. 8 studies cited. The strongest are listed with links to PubMed.

Community. Experiences from people who have tried Partially Hydrolyzed Guar Gum (PHGG). Anecdotes are not medical advice.

Partially Hydrolyzed Guar Gum (PHGG). Soluble fiber for IBS and constipation.

Key compound: mannoseC6H12O6 · 180.16 g/mol

What it is

Soluble fiber for IBS and constipation.

Food sources

Endogenously produced or biosynthesized moleculeStandardized pharmaceutical- or food-grade supplementCombined with cofactors that improve absorption or activity

How it works

Fermented to SCFAs without excessive gas.

Pathways

  • Fermented to SCFAs without excessive gas

Effects

  • +IBS symptoms supports

What the research supports

Improves IBS symptomsmoderate

Strong: consistent results across large trials or meta-analyses. Moderate: several trials, mostly positive. Limited: small or mixed studies. Preclinical: animal or cell research only.

Typical dose
5 g/d
TimingConsistent daily timing recommended; split larger doses if GI tolerance is a concern.
With foodWith a meal containing fat for fat-soluble compounds; otherwise either.
Best formMost evidence is based on the capsule or softgel form.
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Side effects & interactions

Common side effects

  • Mild bloating

Medication interactions

Prescription medications (general)minor

Always disclose Partially Hydrolyzed Guar Gum (PHGG) use to your prescriber — additive, antagonistic, or pharmacokinetic interactions are possible.

Check any supplement–medication combination with your pharmacist before starting.

Combines with

Pairs well

Common forms

  • Capsule or softgel
  • Powder
  • Sublingual or buccal
  • Liposomal liquid

Key studies

8 studies cited in total.

PubMed: Partially Hydrolyzed Guar Gum (PHGG) — Improves IBS symptoms ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Partially Hydrolyzed Guar Gum (PHGG) and "Improves IBS symptoms". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Partially Hydrolyzed Guar Gum (PHGG) — randomized controlled trial ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Partially Hydrolyzed Guar Gum (PHGG) and "randomized controlled trial". Filter by RCT, meta-analysis, or year on the results page.

PubMed: Partially Hydrolyzed Guar Gum (PHGG) — meta-analysis ↗
Systematic review · PubMed (NLM) · 2026

Opens current human and preclinical literature matching Partially Hydrolyzed Guar Gum (PHGG) and "meta-analysis". Filter by RCT, meta-analysis, or year on the results page.

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