Alpha-Galactosidase for Irritable Bowel Syndrome (IBS)

Single study in IBS patients consuming high-FODMAP diet. May reduce gas-related symptoms from specific food triggers.

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The Bottom Line

Single study in IBS patients consuming high-FODMAP diet. May reduce gas-related symptoms from specific food triggers.

Key Study Findings

Review

Gastrointestinal Involvement in Anderson-Fabry Disease: A Narrative Review.

Dose: None vs: None Outcome: None Effect: None None

Population: None

Randomized Controlled Trial Double-blind

A randomized double-blind placebo-controlled crossover pilot study: Acute effects of the enzyme α-galactosidase on gastrointestinal …

Dose: 1200 G vs: placebo Outcome: every 30 min during 7 Effect: None None

Population: patients with ibs after three standardized

Randomized Controlled Trial n=31 2.0 weeks Double-blind

Increasing Symptoms in Irritable Bowel Symptoms With Ingestion of Galacto-Oligosaccharides Are Mitigated by α-Galactosidase Treatment.

Dose: 300 GALU or 150 GALU vs: Placebo (glucose) Outcome: GI symptom severity on VAS Effect: None pP0.006

Population: IBS patients (Rome III, H2 producers)

Randomized Controlled Trial n=125 4 weeks Double-blind

Does oral α-galactosidase relieve irritable bowel symptoms?

Dose: alpha-galactosidase 600 GalU per meal vs: placebo Outcome: overall IBS symptom relief Effect: no significant difference vs placebo >0.05

Population: IBS patients

Key Statistics

Studies

Participants

↑

Positive

Grade

Referenced Papers

Gastrointestinal Involvement in Anderson-Fabry Disease: A Narrative Review. Review

International journal of … 2021 16 citations

A randomized double-blind placebo-controlled crossover pilot study: Acute effects of the enzyme α-galactosidase on gastrointestinal symptoms in irritable bowel syndrome … RCT

Neurogastroenterology and motility 2021 4 citations

Increasing Symptoms in Irritable Bowel Symptoms With Ingestion of Galacto-Oligosaccharides Are Mitigated by α-Galactosidase Treatment. RCT

The American journal … 2018 49 citations

Does oral α-galactosidase relieve irritable bowel symptoms? RCT

Scandinavian journal of … 2016 17 citations

Dosage & Usage

mg = milligrams · mcg = micrograms (1,000× smaller) · IU = International Units

Commonly Used Dosages

general:: 150-300 GalU (alpha-galactosidase units) per serving of gas-producing foods
standardbeanodose:: 300 GalU (2-3 tablets) with first bite of problem food

Upper limit: No established upper limit; adjust per meal as needed

Dosages Studied in Research

Dosage	Duration	Effect	N
None	--	Mixed	--
1200 G	--	Neutral	--
300 GALU or 150 GALU	2.0 weeks	Positive	31
alpha-galactosidase 600 GalU per meal	4 weeks	Neutral	125

Best taken: With the first bite of gas-producing food

Safety & Side Effects

Reported Side Effects

⚠ Generally very well-tolerated
⚠ Rare allergic reactions to mold-derived enzyme (Aspergillus source)
⚠ May cause mild GI discomfort in rare cases

Known Interactions

● Acarbose (alpha-galactosidase may counteract the blood sugar-lowering mechanism of acarbose; contraindicated for concurrent use)
● Miglitol (similar mechanism conflict as acarbose)

Tolerable upper intake: No established upper limit; adjust per meal as needed

Always consult your healthcare provider before starting any supplement.

Frequently Asked Questions

Does Alpha-Galactosidase help with Irritable Bowel Syndrome (IBS)?

Based on 1 studies with 60 participants, there is preliminary evidence that needs more research that Alpha-Galactosidase may support Irritable Bowel Syndrome (IBS) management. Our evidence grade is D (Very Early Research).

How much Alpha-Galactosidase should I take for Irritable Bowel Syndrome (IBS)?

Studies have used various dosages. A commonly studied range is 150-300 GalU (alpha-galactosidase units) per serving of gas-producing foods. Always consult your healthcare provider before starting any supplement regimen.

Are there side effects of Alpha-Galactosidase?

Reported side effects may include Generally very well-tolerated, Rare allergic reactions to mold-derived enzyme (Aspergillus source), May cause mild GI discomfort in rare cases. Most side effects are mild and dose-dependent. Consult your doctor if you experience any adverse reactions.

How strong is the evidence for Alpha-Galactosidase and Irritable Bowel Syndrome (IBS)?

We rate the evidence as Grade D (Very Early Research). This rating is based on 1 peer-reviewed studies with 60 total participants. The overall direction of effect is positive.

Related Evidence

Other ingredients for Irritable Bowel Syndrome (IBS)

Peppermint Oil A Lactobacillus rhamnosus GG B Psyllium Husk B Lactobacillus plantarum B Partially Hydrolyzed Guar Gum (PHGG) B Bifidobacterium longum B

Alpha-Galactosidase for other conditions

Bloating and Intestinal Gas B

Quick Verdict

Single study in IBS patients consuming high-FODMAP diet. May reduce gas-related symptoms from specific food triggers.

Evidence Strength30%

Low confidence

Study Breakdown

RCT (3)Meta (0)Other (0)

Compare Alternatives

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Learn More

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.