Beano is an over-the-counter digestive enzyme supplement that prevents gas and bloating from beans, vegetables, and other plant-based foods. It works by breaking down specific complex sugars in your food before they can reach your lower intestine, where bacteria would otherwise ferment them and produce gas.
How Beano Works in Your Gut
The active ingredient in Beano is an enzyme called alpha-galactosidase. Your body doesn’t naturally produce this enzyme, which means certain complex sugars in plant foods pass through your stomach and small intestine completely intact. When these undigested sugars arrive in your large intestine, gut bacteria feed on them and release gas as a byproduct. That’s what causes the bloating, cramping, and flatulence many people experience after eating beans or certain vegetables.
Beano supplies the missing enzyme. When you take it with food, the alpha-galactosidase breaks down those complex sugars into simpler ones your body can absorb in the small intestine, before they ever reach the gas-producing bacteria in your colon. The sugars get digested and absorbed like any other nutrient instead of sitting around fermenting.
The Specific Sugars Beano Targets
The complex sugars Beano breaks down belong to a family called raffinose family oligosaccharides, or RFOs. These include raffinose, stachyose, and verbascose, which are chains of sugar molecules linked together in a way that human digestive enzymes simply can’t break apart. Without alpha-galactosidase, these sugars are neither absorbed nor broken down anywhere in the upper digestive tract. They accumulate in the large intestine, where bacteria do the job your body couldn’t.
These sugars are found in a wide range of foods, not just beans. High-RFO foods include:
- Legumes: red kidney beans, chickpeas, baked beans, split peas, lentils
- Nuts: cashews and pistachios
- Vegetables: green peas, butternut pumpkin, beetroot
- Grain products: freekeh
- Soy products: soy milk made from whole soybeans, hummus
- Other: oat milk, custard apple
If you consistently get gassy after eating foods from this list, those RFO sugars are likely the culprit, and Beano is designed specifically for them.
When and How to Take It
Timing matters. Beano works best when the enzyme is present in your stomach alongside the food it needs to break down. The recommended approach is to swallow one capsule right before your first bite of a gas-producing meal. If you forget, you have a window of up to 30 minutes after your first bite for it to still be effective. Each capsule contains 600 GALU (galactose units), which is the standard single serving.
Taking Beano after a meal has fully digested won’t help. By that point, the undigested sugars have already moved past the small intestine and into the colon, where fermentation is underway. The enzyme needs to meet the food early in digestion to do its job.
What Beano Won’t Help With
Beano is specific to one type of gas-causing sugar. It won’t help with every source of digestive discomfort. If your gas comes from lactose (the sugar in milk and dairy), you need a different enzyme entirely: lactase. Beano and Lactaid target completely different sugars and are not interchangeable.
Beano also won’t reduce gas caused by insoluble fiber, the roughage in whole grains, bran, and leafy greens. That type of fiber causes gas through a different mechanism, and alpha-galactosidase doesn’t act on it. Similarly, if bloating is caused by carbonated drinks, swallowed air, or fat-heavy meals, Beano won’t make a difference.
A Caution for People on Diabetes Medication
Because Beano converts complex sugars into simple ones your body absorbs, it can affect blood sugar levels in a specific situation. If you take acarbose, a diabetes medication that works by slowing carbohydrate digestion, Beano can partially counteract it. A study published in PubMed found that patients taking both acarbose and Beano had higher post-meal blood sugar levels than those on acarbose alone. The blood sugar levels were still significantly lower than without any medication, but the interaction is real. If you take acarbose or a similar medication, this is worth discussing with your doctor before adding Beano to your routine.
For most people, Beano is well tolerated. The enzyme itself is a protein that gets digested along with the rest of your food, and it has been sold over the counter for decades without significant safety concerns.
Who Benefits Most From Beano
People who notice a clear pattern of gas and bloating after eating beans, lentils, or the other high-RFO foods listed above are the best candidates. This includes people with irritable bowel syndrome who are sensitive to galacto-oligosaccharides (GOS), a subcategory of the sugars Beano targets. Research from Monash University, the group behind the low-FODMAP diet, has shown that alpha-galactosidase enzyme therapy can help reduce symptoms in IBS patients sensitive to GOS-containing foods like legumes, soy milk, and nuts.
If you’ve been avoiding beans or chickpeas because of how they make you feel, Beano offers a straightforward way to reintroduce those foods without the aftermath. It won’t change the nutritional value of your meal. It simply handles the one component your body was never equipped to digest on its own.