Alpha-Galactosidase (Beano).
Bean gas eliminator. The Beano enzyme.
Reviewed March 2026
- Category
- Enzyme
- Also filed under
- GasBeansVegetables
What Alpha-Galactosidase (Beano) is, and what it does.
- Does it work
- Works well for its specific purpose. If beans and cruciferous vegetables cause you problems, this is an effective solution.
- How much to take
- 150-1200 GalU per meal containing problem foods. Take with first bite.
- Time to feel it
- It acts inside the meal itself, so the difference turns up over the next few hours. There's no build-up phase, and taking it after you've finished eating comes too late.
- The first dose
- Works within that meal. Less gas and bloating from trigger foods.
- With regular use
- No cumulative effect. Works meal by meal.
- How well tolerated
- Well tolerated. Just an enzyme your body is missing.
- How it feels
- Relief from the discomfort that beans usually cause.
- The overlooked benefit
- It only cleaves the alpha-linked galactose sugars in beans and cruciferous veg. If it changes nothing after dairy or wheat, that tells you your actual trigger sits elsewhere.
150 to 450mg a day is where Alpha-Galactosidase (Beano) works.
Source: Di Stefano et al. Dig Dis Sci 2007; Beano product research
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Based on 20 human trials.
- Reduces gas from beansMultiple controlled trials
Questions people ask about Alpha-Galactosidase (Beano).
- When should I take it?
- Timing matters less than consistency. Pick a time that works for you and take it daily.
- Can I take it with other supplements?
- Usually fine. The main thing to watch is not doubling up on the same ingredient from different products. If you're on prescription meds, check with your pharmacist first.
- Any side effects to watch for?
- Most people tolerate it well at recommended doses. GI upset is the most common complaint with any supplement. Start with a lower dose and work up. If something feels off, stop and reassess.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Alpha-galactosidase cleaves the alpha-1,6 galactoside bonds in raffinose and stachyose, while lactase cleaves the beta-galactoside bond in lactose. Neither enzyme acts on the other's substrate, so the pair covers both.
Protease, lipase and amylase blends carry no activity against alpha-galactosides, which is why legume sugars pass undigested into the colon. Adding alpha-galactosidase closes that specific gap.
Amylase handles alpha-1,4 linked starch while alpha-galactosidase handles the alpha-1,6 galactosyl linkages amylase cannot reach. Together they cover the two bond types in a legume or grain meal.
Bromelain breaks down the protein fraction of a legume meal while alpha-galactosidase handles its oligosaccharide fraction. The substrates do not overlap.
Galactooligosaccharides are the alpha-galactoside substrate this enzyme cleaves, so taking them together converts the prebiotic into simple sugars in the small intestine. The colonic fermentation the prebiotic is taken for does not happen.
Alpha-galactosidase strips the galactose side units from a galactomannan backbone, the same reaction used industrially to modify guar. That changes the viscosity and the fermentation profile of the fibre.
Hydrolysing raffinose and stachyose in the small intestine removes substrate that colonic bacteria would otherwise ferment. The gas reduction is the intent, and the same step lowers the fermentable feed reaching the live cultures.
Fungal alpha-galactosidase loses activity as gastric pH drops, and betaine hydrochloride is taken specifically to lower it. Taken in the same swallow, less active enzyme reaches the meal.
Pepsin cleaves proteins in the acidic stomach while alpha-galactosidase cleaves alpha-1,6 galactosyl bonds on legume oligosaccharides. The two work on different substrates, which is why digestive blends carry both. Pepsin needs low gastric pH to function, so anything raising stomach pH changes its contribution and not the glycosidase's.
Pancreatin supplies amylase, protease and lipase activity, none of which can open the alpha-1,6 galactosyl linkages in raffinose and stachyose. That gap is exactly what alpha-galactosidase fills, and it is why humans lack the ability to digest these sugars in the first place. The pair covers starch, protein, fat and legume oligosaccharides in one product.
Lipase acts on triglycerides and has no activity on galactoside bonds. Combining it with alpha-galactosidase widens what a blend covers in a mixed meal. Both are proteins and both lose activity to heat and to prolonged low gastric pH.
Papain is a cysteine protease from papaya that works over a broad pH range on protein, a different substrate class entirely. Blends pair it with alpha-galactosidase to cover legume protein and legume oligosaccharides together. Neither enzyme substitutes for the other.
Phytase hydrolyses phytic acid, the legume compound that binds iron, zinc and calcium in the gut lumen, while alpha-galactosidase removes the oligosaccharides that reach the colon and ferment. Both target the parts of beans that humans handle poorly, by unrelated chemistry. Mineral absorption changes are measured as absorption markers rather than as status outcomes.
Inulin is a fructan built on beta-2,1 fructosyl bonds, which alpha-galactosidase cannot cleave. Someone using the enzyme for bean gas will find it does nothing about gas from an inulin supplement. Knowing the scope limit is the useful part of this pairing.
Fructooligosaccharides ferment quickly in the proximal colon and produce gas, and alpha-galactosidase cannot touch their fructosyl linkages. Pairing the two does not cancel the gas from the prebiotic. State the boundary rather than assume enzyme coverage.
Several Lactobacillus species, L. plantarum among them, express alpha-galactosidase and can metabolise raffinose-family oligosaccharides. That gives a second route to breaking down the same sugars, in the colon rather than the upper gut. Where the breakdown happens decides whether gas is produced, so the two routes are not equivalent.
S. boulardii is a yeast that does not depend on the enzyme's substrate and is used for general gut tolerance rather than for legume oligosaccharides specifically. The two appear in the same product for two different reasons. No combination study is available here.
Menthol relaxes gastrointestinal smooth muscle through calcium channel blockade, which is a different route to abdominal comfort than removing the fermentable substrate. Enteric coating is what keeps peppermint oil past the stomach, and an uncoated dose can bring on reflux. The pairing covers substrate and motility in one product.
Ginger's gingerols speed gastric emptying and act on gut motility, which changes how quickly a legume meal reaches the enzyme's working window. That interaction could cut either way and has not been measured with alpha-galactosidase. Timing is where the practical question sits.
Activated charcoal adsorbs proteins non-selectively, and alpha-galactosidase is a protein. Taken in the same mouthful, the charcoal can bind the enzyme before it reaches its substrate. If both are wanted, they belong at separate times.
Bentonite binds proteins and charged molecules through surface adsorption and ion exchange, which puts an enzyme protein at risk of being taken out of play. The enzyme has to survive to the substrate to do anything. Spacing them apart preserves both.
Psyllium forms a viscous gel that slows how quickly enzymes and substrates find each other in the gut lumen. That can delay the enzyme's action on legume oligosaccharides without stopping it. The interaction is a mixing effect and has not been quantified with this enzyme.
Calcium carbonate neutralises gastric acid and raises stomach pH substantially, moving the enzyme away from the acidic window it was selected to work in. Fungal alpha-galactosidase is acid-tolerant, so the concern is a shift in conditions rather than outright destruction. Take them apart if both are wanted with the same meal.
Nothing specific on file for Alpha-Galactosidase (Beano). Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Alpha-Galactosidase (Beano) actually does.
The enzyme snips the galactose units off the bean sugars raffinose and stachyose, leaving simple sugars the small intestine can absorb.
People simply do not make an enzyme for these bean sugars, which is why they travel all the way to the large intestine.
Gut bacteria ferment those sugars and produce hydrogen and carbon dioxide as they go, and methane in people whose gut bacteria make it. That gas is what makes beans uncomfortable.
The enzyme only works if it is mixed in with the food, so it goes down with the first bites. Taken afterwards it has missed its window.
Where Alpha-Galactosidase (Beano) comes from.
A mould called Aspergillus niger is grown in a tank and makes the enzyme. It is filtered out, concentrated, and mixed with a carrier until each serving hits a set strength.
Produced by a cultured organism rather than harvested. The strain is selected and the conditions are controlled, so batches sit closer together than a field crop.
A production strain is grown on a defined carbohydrate and nitrogen medium; A. niger is the usual industrial source for this glycosidase.
The organism secretes alpha-galactosidase into the medium, with substrate composition and pH used to induce and hold enzyme expression.
Cells and solids are removed by filtration or centrifugation, leaving the enzyme in the clarified broth.
Ultrafiltration concentrates the enzyme and removes low molecular weight fermentation constituents; further polishing steps depend on the grade.
The concentrate is assayed for galactosidase activity and cut with a carrier such as maltodextrin to a declared GalU per serving.
Dried and compressed, encapsulated, or formulated into a glycerin or aqueous drop presentation.
Labels often give a milligram weight of an enzyme blend without a GalU figure, and the fermentation carrier and the assay conditions behind a declared unit are rarely stated, which is what makes two products hard to compare.
Getting Alpha-Galactosidase (Beano) from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- In 8 healthy volunteers eating a bean-rich test meal, 1200 GalU of the enzyme reduced breath hydrogen and the severity of flatulence, and both tested doses lowered the total symptom score.Randomised trial. Di Stefano 2007 (Digestive Diseases and Sciences). PMID 17151807 ↗
These are the studies our verdict leans on, chosen from the 889 we read for Alpha-Galactosidase (Beano). The full linked list is below.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
