What Is in Beano? Active and Inactive Ingredients

Beano’s active ingredient is alpha-galactosidase, an enzyme derived from a food-grade mold called Aspergillus niger. This single enzyme does all the heavy lifting: it breaks down certain complex sugars found in beans, vegetables, and whole grains before gut bacteria can ferment them into gas. The inactive ingredients vary slightly between Beano’s tablet and liquid drop formulations, but they serve as binders, fillers, and flavoring agents rather than contributing to the product’s digestive function. Understanding what each component does, and what the enzyme cannot do, clears up a lot of the confusion around when Beano is worth taking and when it won’t help.

Alpha-Galactosidase, the Only Active Ingredient

Each Beano tablet contains 300 galactosidase units (GalU) of alpha-galactosidase. This enzyme belongs to a class of proteins that clip specific chemical bonds in complex sugars. In Beano’s case, the target bonds are the ones linking galactose molecules together in sugars like raffinose, stachyose, and verbascose. These are the oligosaccharides responsible for gas production after you eat beans, lentils, broccoli, cabbage, and similar foods. Your small intestine lacks the enzyme needed to break them down on its own, so they pass intact into the colon, where bacteria feast on them and produce hydrogen, methane, and carbon dioxide as byproducts.

Alpha-galactosidase steps in at the small-intestine stage. Taken with the first bite of food, it breaks those oligosaccharides into simpler sugars, mainly galactose and sucrose, that your body can absorb before they ever reach the colon. Less substrate for the bacteria means less gas. The enzyme is sourced from Aspergillus niger, a common mold used across the food industry to produce enzymes, citric acid, and other compounds. It is classified as a dietary supplement in the United States, not a drug, so it does not go through the same FDA approval process that prescription medications do.

Inactive Ingredients in the Tablet

The standard Beano tablet (the “Meltaway” formulation) lists several inactive ingredients whose roles are straightforward. Cellulose gel and mannitol serve as bulking agents that give the tablet its physical structure. Potato starch acts as a disintegrant, helping the tablet break apart in your stomach so the enzyme can get to work. Sorbitol provides a touch of sweetness, while natural and artificial flavors round out the taste. Magnesium stearate, a common lubricant in supplement manufacturing, prevents the tablet mixture from sticking to machinery during production. Colloidal silicon dioxide keeps the powder flowing smoothly.

None of these inactive ingredients have a meaningful digestive effect at the quantities present in a single tablet. The one exception worth knowing about is sorbitol. In large doses, sugar alcohols like sorbitol can themselves cause bloating and diarrhea, but the trace amount in a Beano tablet is far below the threshold that would cause trouble for most people. If you use the liquid drop formulation instead of tablets, the inactive ingredient list changes: it typically includes water, glycerol, and potassium sorbate as a preservative, with the same alpha-galactosidase enzyme suspended in the liquid.

Which Foods Beano Actually Targets

Beano is designed to work on a specific family of sugars, not on all sources of digestive gas. The raffinose family oligosaccharides (RFOs) are the main targets: raffinose itself, stachyose, and verbascose. These are concentrated in legumes, though the exact mix varies by species. In most beans and lentils, stachyose is the dominant oligosaccharide, but in mung beans and broad beans, verbascose predominates instead.¹ Alpha-galactosidase handles all three of these sugars, so the enzyme works regardless of which legume is on your plate.

Beyond legumes, RFOs show up in cruciferous vegetables like broccoli, Brussels sprouts, and cabbage, as well as in whole grains and some nuts. These foods generally contain lower concentrations than beans, which is why a bowl of lentil soup tends to cause more gas than a side of steamed broccoli. Beano will help with any of them, since the underlying sugar chemistry is the same.

Where Beano will not help is with gas caused by other mechanisms entirely. Lactose intolerance involves a different sugar (lactose) and a different missing enzyme (lactase). Fructose malabsorption involves yet another pathway. Carbonated drinks introduce gas directly. And some people produce excess gas from fiber fermentation or from conditions like small intestinal bacterial overgrowth, neither of which involves RFOs. If your gas problems persist despite taking Beano with meals, the culprit is probably not raffinose-family sugars.

Does Beano Actually Reduce Gas?

The clinical evidence is generally positive, though the effects are more modest than the marketing suggests. In an early double-blind crossover trial, participants who ate a high-fiber meal with alpha-galactosidase had significantly fewer flatulence events per hour over the six-hour follow-up period compared to placebo. However, the difference was statistically clear only at the five-hour mark, and no difference was found in bloating or pain.²

A later study tested two doses of alpha-galactosidase (300 GalU and 1200 GalU) against placebo. The higher dose significantly reduced both breath hydrogen excretion, a direct measure of colonic fermentation, and the severity of flatulence. Both doses produced a significant reduction in total symptom scores.³ That finding matters practically because a single Beano tablet contains 300 GalU, meaning that taking two or three tablets with a particularly bean-heavy meal, as the product labeling suggests, would bring you closer to the higher dose that performed best.

A randomized, double-blind trial in children found that alpha-galactosidase significantly reduced pain scores and the number of days with moderate-to-severe bloating compared to placebo. It also reduced the proportion of patients with significant flatulence. Interestingly, though, no significant difference was found for abdominal distension or spasms.⁴ Taken together, the evidence says alpha-galactosidase reliably reduces gas production and the discomfort that comes with it, but it is not a magic eraser for every symptom. Bloating and cramping have multiple causes, and eliminating one gas source does not always resolve them.

Timing and Dosing Matter More Than People Realize

The most common reason Beano “doesn’t work” for someone is that they took it at the wrong time. Alpha-galactosidase needs to meet the offending sugars in the small intestine, which means you need to take it with your first bite of the problem food, not after you have finished eating and already feel full. If the oligosaccharides have already moved past the small intestine and into the colon, no amount of enzyme swallowed after the fact will help.

The standard recommendation on the label is two to three tablets per meal. As the dosing study described above showed, higher doses produce a stronger effect.³ A bowl of three-bean chili likely calls for the upper end of the dosing range, while a side dish with a small amount of broccoli might need only one tablet. The product is considered safe enough that overshooting slightly is not a concern for most people, though there is no benefit to taking dramatically more than needed.

Temperature also plays a role, though this matters more for the liquid drops than for the tablets. Alpha-galactosidase is a protein, and like all enzymes, it can be deactivated by heat. Adding the drops to food that is still very hot can reduce the enzyme’s activity. Letting the food cool slightly before adding drops, or simply taking the tablet form alongside the meal, avoids this issue.

Who Should Be Cautious

Beano is well tolerated by most people, but there are two specific groups who should think twice. The first is anyone with galactosemia, a rare inherited condition in which the body cannot properly metabolize galactose. Since alpha-galactosidase works by liberating galactose from complex sugars, taking it could theoretically increase the galactose load in someone who already cannot process it.⁵ Galactosemia is typically diagnosed in infancy, so most adults who have it already know, but it is worth flagging.

The second group is people taking acarbose (sold under the brand name Precose), a diabetes medication that works by slowing carbohydrate digestion. Because Beano speeds up the breakdown of certain carbohydrates, it partially counteracts what acarbose is trying to do. A study examining this interaction found that when Beano was taken alongside acarbose, postprandial blood sugar levels were higher than with acarbose alone. The good news is that the combination still lowered blood sugar significantly compared to taking neither medication, so Beano did not completely cancel out the drug’s effect.⁶ Still, anyone on acarbose should talk with their doctor before adding Beano to the mix, since even a partial reduction in drug effectiveness matters for blood sugar management.

For pregnant or breastfeeding women, there is no specific safety data on alpha-galactosidase supplements, which is typical of dietary supplements in general. The enzyme is not absorbed into the bloodstream in any meaningful amount, since it does its work in the gut lumen and is itself digested like any other protein. That said, the standard advice of checking with a healthcare provider applies.

Your Gut Can Partially Adapt on Its Own

One of the more interesting findings in gut-gas research is that your body can reduce its own gas production over time if you stick with the foods causing it. When people begin consuming fermentable carbohydrates regularly, total gas volume initially spikes, increasing by about 37% in one study. But after two weeks of continued consumption, gas volume declined back to baseline. The gut also appeared to get better at reabsorbing gas before it reached the end of the digestive tract.⁷

This suggests that the colonic microbiome adjusts its fermentation patterns as it gets used to a new substrate. The practical takeaway: if you are adding beans or other high-RFO foods to your diet for the first time, or returning to them after a long break, the worst gas will come in the first week or two. Beano can bridge that adjustment period. Some people find they need it less, or not at all, once their gut has had time to recalibrate. Others, particularly those who eat these foods only occasionally, may benefit from keeping it on hand permanently since their microbiome never fully adapts.

How Natural Alpha-Galactosidase Differs from a Tablet

Beano is not the only source of alpha-galactosidase in nature. Certain gut bacteria produce the enzyme themselves, which is part of why adaptation occurs. Research in animal models has shown that the bacterium Lactobacillus fermentum produces enough alpha-galactosidase to significantly reduce hydrogen gas output when coadministered with soy milk. In rats colonized with a single gas-producing bacterium, the addition of L. fermentum cut hydrogen emissions by about half, and in rats with a more complex, human-like microbiome, the reduction was roughly 70%.⁸

This is animal data, so it does not directly prove that eating probiotic yogurt will replace Beano for you. But it does illustrate that the gut’s own microbial community has the biochemical tools to handle these sugars. A supplement like Beano delivers the enzyme in a concentrated, immediate form, while a well-adapted gut microbiome provides a slower, ongoing version of the same chemistry. The two approaches are not mutually exclusive, and for people who eat a varied diet with irregular bean consumption, the supplement fills a gap that the microbiome has not been given the chance to close.

Traditional Cooking Methods and Soaking

Before commercial enzyme supplements existed, cooks dealt with the gas problem at the food-preparation stage. Soaking dried beans overnight and discarding the soaking water removes a meaningful fraction of the water-soluble oligosaccharides. Extended cooking, particularly pressure cooking, further breaks down these sugars. Some traditional cuisines add ingredients like kombu seaweed to bean pots, which contains its own enzymes that may contribute to oligosaccharide breakdown, though controlled studies on this specific practice are scarce.

These methods reduce the oligosaccharide load reaching your gut, which is effectively the same thing Beano does, just at an earlier stage. The difference is one of convenience and completeness. Soaking removes some RFOs but not all, and it does nothing for vegetables or whole grains eaten in other meals. Beano offers a per-meal solution without requiring changes to food preparation. Many people who eat beans regularly use both approaches: soak and cook the beans thoroughly, and take a tablet if the meal still tends to cause discomfort. Canned beans, incidentally, have already been soaked and cooked at high temperatures during processing, which is why they tend to cause less gas than home-cooked dried beans that were not soaked long enough.

Store-Brand Alternatives and Generic Versions

Beano is the most recognized brand, but it is not the only alpha-galactosidase supplement on the market. Store-brand versions sold by major pharmacies and retailers contain the same active enzyme, often at the same 300 GalU per tablet dose. Because alpha-galactosidase is a well-characterized enzyme and Beano is a dietary supplement rather than a patent-protected drug, generic versions can replicate the formula closely. The inactive ingredients may differ between brands, with some using different fillers or flavorings, but the enzyme itself is the same molecule sourced from the same organism.

Some broader digestive enzyme blends marketed for general digestive support include alpha-galactosidase alongside other enzymes like lipase, protease, and amylase. These combination products work on a wider range of foods but may contain a lower dose of alpha-galactosidase per serving than a dedicated product like Beano. If your main issue is bean-related gas rather than general digestive discomfort, a focused alpha-galactosidase product at an adequate dose is the more targeted choice. If you suspect multiple food groups are giving you trouble, the broader blend may be worth trying, though at that point it is also worth considering whether an underlying condition like irritable bowel syndrome or food intolerance warrants professional evaluation rather than more supplements.