Supplement encyclopedia

Alpha-galactosidase

Name: Alpha-galactosidase
Creator: Pillintrip Editorial Team

Written by Pillintrip Editorial Team Updated October 30, 2026

Alpha-galactosidase is a digestive enzyme that breaks down certain oligosaccharides in legumes and other foods.

Recheck the conclusions and examine the sources before choosing a supplement.

Main conclusion

Potential benefits

Alpha-galactosidase may reduce gas after legumes. Its action relates to specific food carbohydrates; findings for bloating and pain are less convincing. [1] [2]

What was studied

Gas after legumes: One test meal; observation after eating; Gas and bloating after meals: Two test meals; six hours of observation each. [1] [2]

How to obtain it from food

The enzyme is matched to specific foods: beans, chickpeas, lentils, soybeans, some nuts and products made from them. It helps break down GOS in the dish rather than providing a dietary “enzyme requirement.” The composition, serving size and tolerability of legumes vary. Milk sugar requires a different enzyme, lactase; alpha-galactosidase activity should not automatically be assumed for symptoms after foods containing fructans or polyols. [1] [2]

Effects and studied questions

Goal or question	Result	Confidence	Studies	Population studied	Key sources
Gas after legumes	May be considered for gas specifically after legumes, taking account of the enzyme activity on the label.At 1200 GalU, flatulence severity and hydrogen excretion decreased; total symptoms decreased at both doses. This small sample makes it difficult to estimate a reliable effect size for usual portions.	2/5	1One direct trial described; the count refers to the named publication, not the entire literature.The effect of oral alpha-galactosidase on intestinal gas production and gas-related symptoms ↗	Eight healthy adults	The effect of oral alpha-galactosidase on intestinal gas production and gas-related symptoms ↗
Gas and bloating after meals	The effect on bloating and pain is less convincing than the effect on the number of gas episodes.There were fewer episodes of passing gas over six hours. No significant differences in bloating or pain were found.	2/5	1One direct trial described; the count refers to the named publication, not the entire literature.Does Beano prevent gas? A double-blind crossover study of oral alpha-galactosidase to treat dietary oligosaccharide intolerance. ↗	30 adults enrolled; 19 completed both test meals	Does Beano prevent gas? A double-blind crossover study of oral alpha-galactosidase to treat dietary oligosaccharide intolerance. ↗

The study count refers to the cited source. Reviews with overlapping trials and outcomes from one study are not added together.

Guidance for each goal

Gas after legumes

Confidence2/5

May be considered for gas specifically after legumes, taking account of the enzyme activity on the label.

Study findings. At 1200 GalU, flatulence severity and hydrogen excretion decreased; total symptoms decreased at both doses. This small sample makes it difficult to estimate a reliable effect size for usual portions.

Studied regimen300 or 1200 GalU with 420 g of beansAlpha-galactosidase food enzyme

Duration and populationOne test meal; observation after eatingEight healthy adults

The confidence scale assesses the reliability of this conclusion, not the probability of an individual result.

Gas and bloating after meals

Confidence2/5

The effect on bloating and pain is less convincing than the effect on the number of gas episodes.

Study findings. There were fewer episodes of passing gas over six hours. No significant differences in bloating or pain were found.

Studied regimenEight drops of the studied product with foodEnzyme drops with a legume dish

Duration and populationTwo test meals; six hours of observation each30 adults enrolled; 19 completed both test meals

The confidence scale assesses the reliability of this conclusion, not the probability of an individual result.

How to read the confidence scale 1–5

The rating considers study quality, directness and applicability to the stated group and regimen. It is an editorial scale, not the probability of an individual result.

Safety and limitations

Allergy and digestive complaints may occur. In a 12-week IBS study, pain and diarrhea were more often cited as reasons for withdrawal with the enzyme; causality was not established. Beano may weaken the effect of acarbose on post-meal blood sugar. Discuss use with a professional in diabetes, pregnancy, breastfeeding or long-term use. The two-week trial reviewed in children with recurring gas complaints reported relief of some symptoms. An adult regimen should not be applied to a child. Beano use in a study may have weakened the post-meal glucose reduction with acarbose. The Canadian monograph specifies taking it with the first bite of food and activity in GalU; the licensing range is not an established optimal clinical dose.

Innovative concepts in diet therapies in disorders of gut-brain interaction ↗ · Efficacy and tolerability of α-galactosidase in treating gas-related symptoms in children: a randomized, double-blind, placebo controlled trial ↗ · Does oral α-galactosidase relieve irritable bowel symptoms? ↗ · Increasing Symptoms in Irritable Bowel Symptoms With Ingestion of Galacto-Oligosaccharides Are Mitigated by α-Galactosidase Treatment ↗ · Effects of beano on the tolerability and pharmacodynamics of acarbose ↗ · Alpha-Galactosidase — Natural Health Product Monograph, 10 January 2025 (Health Canada) ↗

Forms

Oral alpha-galactosidase: Origin and activity in GalU/FCC GalU matter when comparing products. Drops, tablets, capsules: Product weight and number of dosage units do not replace the enzyme activity value. Lactase and enzyme mixtures: Lactase acts on lactose; a mixture is not a study of a single enzyme.

Food sources

Innovative concepts in diet therapies in disorders of gut-brain interaction ↗

Studies

Publication	What was studied	Participants	Form and dose	Result
The effect of oral alpha-galactosidase on intestinal gas production and gas-related symptoms ↗	Gas after legumes	Eight healthy adults	Alpha-galactosidase food enzyme: 300 or 1200 GalU with 420 g of beans. One test meal; observation after eating	At 1200 GalU, flatulence severity and hydrogen excretion decreased; total symptoms decreased at both doses. This small sample makes it difficult to estimate a reliable effect size for usual portions.
Does Beano prevent gas? A double-blind crossover study of oral alpha-galactosidase to treat dietary oligosaccharide intolerance. ↗	Gas and bloating after meals	30 adults enrolled; 19 completed both test meals	Enzyme drops with a legume dish: Eight drops of the studied product with food. Two test meals; six hours of observation each	There were fewer episodes of passing gas over six hours. No significant differences in bloating or pain were found.