The fastest relief for stomach gas comes from simethicone, the active ingredient in products like Gas-X and Mylanta Gas. It works within minutes by lowering the surface tension of gas bubbles trapped in your stomach and intestines, letting them merge and pass more easily. But simethicone isn’t your only option, and the best choice depends on whether your gas is a one-time nuisance or a recurring problem.
Simethicone: The Go-To for Quick Relief
Simethicone is a defoaming agent, meaning it physically breaks down the frothy layer of mucus-coated gas bubbles in your gut. Once those tiny bubbles combine into larger ones, your body can expel them through burping or flatulence instead of leaving them trapped and painful. It’s available over the counter in chewable tablets, softgels, and liquid drops. Because simethicone isn’t absorbed into your bloodstream, it has essentially no side effects and is safe for most people, including infants (in drop form).
The main limitation is that simethicone only addresses gas that’s already there. It doesn’t prevent new gas from forming, so if your diet or digestion is the root cause, you’ll keep reaching for it.
Bismuth Subsalicylate for Foul-Smelling Gas
If your main complaint is the smell rather than the pressure, bismuth subsalicylate (the active ingredient in Pepto-Bismol) targets a different part of the problem. It binds more than 95% of sulfide gases in the gut, which are the compounds responsible for that rotten-egg odor. This won’t reduce the volume of gas you produce, but it can make the social consequences far less noticeable. The typical approach is four doses spread throughout the day, though long-term daily use isn’t recommended because bismuth can accumulate in your system.
Peppermint Oil for Bloating and Cramping
Peppermint oil relaxes the smooth muscle lining your intestines, which helps trapped gas move through instead of sitting in one spot and causing pain. The key is choosing enteric-coated capsules so the oil releases in your intestines rather than your stomach, where it can trigger heartburn. The standard dose for adults is one capsule three times a day, increasing to two capsules three times a day if needed. Peppermint oil is particularly useful if your gas comes with crampy, bloated discomfort rather than just pressure.
Probiotics for Recurring Gas
If gas is something you deal with regularly, a probiotic may help by shifting the balance of bacteria in your gut toward species that produce less gas during digestion. Not all probiotics are equal here. One of the best-studied strains for gas and bloating is Bifidobacterium infantis 35624, which was tested in a trial of 362 people with irritable bowel syndrome. At a specific dose, it significantly reduced bloating, passage of gas, and abdominal pain compared to placebo after four weeks. Interestingly, a dose 100 times higher showed no benefit, suggesting more isn’t better with probiotics.
Probiotics aren’t a quick fix. You typically need to take them daily for several weeks before noticing a difference, and the benefits are most pronounced for people whose gas is tied to an underlying digestive pattern like IBS rather than a single meal that didn’t agree with them.
Dietary Changes That Reduce Gas at the Source
Every remedy above addresses gas after it forms. If you want to produce less gas in the first place, what you eat matters more than what you take. Gas is a byproduct of bacteria in your large intestine fermenting carbohydrates your small intestine didn’t fully absorb. Some foods are notorious for this: beans, lentils, broccoli, cabbage, onions, wheat, and certain fruits like apples and pears.
These foods all contain types of carbohydrates collectively called FODMAPs, short-chain sugars that ferment quickly in the gut. A low-FODMAP eating plan, developed at Monash University, temporarily removes these foods and then reintroduces them one at a time so you can identify your personal triggers. Research from Johns Hopkins Medicine found this approach reduces digestive symptoms in up to 86% of people who follow it. You don’t need to stay on a restricted diet permanently. The goal is to pinpoint which specific foods cause your gas and avoid only those.
Simpler changes can also help. Eating more slowly reduces the amount of air you swallow, which is a major source of upper stomach gas and belching. Cutting back on carbonated drinks eliminates another obvious source. And if dairy gives you trouble, a lactase supplement taken with your first bite of dairy can break down the milk sugar before bacteria get a chance to ferment it.
Activated Charcoal: Limited Evidence
Activated charcoal is widely marketed for gas relief, and the idea is that its porous surface traps gas molecules in the gut. The research, however, is limited. A few small studies suggest it may help, but the FDA does not regulate it the same way it regulates medications, and charcoal can bind to other drugs you’re taking, reducing their effectiveness. If you’re on any prescription medications, this is one to be cautious with.
When Gas Signals Something Else
Occasional gas is normal. Most people pass gas 13 to 21 times a day. But certain patterns warrant attention: gas symptoms that change suddenly, gas paired with unexplained weight loss, persistent abdominal pain, or changes in bowel habits like new constipation or diarrhea. These combinations can point to conditions like celiac disease, small intestinal bacterial overgrowth, or inflammatory bowel disease, all of which are treatable once identified. A sudden shift in your baseline is the signal worth paying attention to, not the gas itself.