Medicines & personal care · Haleon

Is Gas-X gluten-free?

Evidence

CPublished label or regulation

Last checked

2026-08-10

Varies by country

No

Source foodisgood.com+3 more

Why

Gas-X is the textbook version of the problem this whole category has.

Drugs sit outside the food labelling rule. The FDA's gluten-free labelling rule governs food. An over-the-counter drug label must name its inactive ingredients, but it does not have to state where those ingredients came from, and it is under no obligation to declare gluten at all. The FDA has published guidance encouraging drug manufacturers to state gluten content voluntarily, guidance, not a requirement. Most decline. Gas-X's silence is therefore normal and tells you precisely nothing.

The softgels are structurally simple. Simethicone is an inert silicone polymer; it is not derived from grain and never has been. The shell is gelatin and glycerin, the fill is a sorbitol/peppermint oil carrier, the rest is colouring and titanium dioxide. There is no starch, no maltodextrin, no wheat starch, no dextrin binder, nothing in that list has a plausible grain route. Ingredient-screening databases clear the softgel formats for that reason.

The chewables are the actual question. Gas-X Extra Strength chewable tablets list calcium phosphate tribasic, colloidal silicon dioxide, D&C Red No. 30 aluminium lake, dextrose, flavors, maltodextrin, propylene glycol, silicon dioxide and soy protein isolate. Maltodextrin is the flagged ingredient. In practice, maltodextrin sold in the US is overwhelmingly corn-derived, and wheat-derived maltodextrin in a US product would trip FALCPA wheat declaration in food, but a drug isn't food, so that safety net doesn't formally apply here. "Flavors" is the second unsourced term. Neither is resolvable from the carton.

Gluten Free Watchdog has tested it. Their product database carries a test report for Gas-X Extra Strength, explicitly filed under "Not Labeled GF." The actual ppm result sits behind a subscription and we are not going to guess at it, or paraphrase a number we haven't seen. Gluten Free Watchdog is an independent subscription testing service rather than a national celiac organisation, so what we can actually cite is its free index entry, secondary reporting, not a published result. What that entry does confirm is that a testing organisation considered the product worth testing and that the pack carries no gluten-free label. If you already subscribe, that report is the single most direct answer available.

Haleon documents other brands but not this one. The same company publishes a gluten statement for TUMS, retail listings carry the manufacturer line that all TUMS products have been gluten tested and meet the guidelines for "gluten free." No equivalent exists for Gas-X. That asymmetry is the clearest evidence that the silence here is a business decision about a specific brand, not a company-wide policy of never saying anything.

How much risk is this?

Celiac disease: the practical risk is low and the uncertainty is real. The entire inactive-ingredient mass of one chewable tablet is a few hundred milligrams; the maltodextrin fraction is smaller still; and maltodextrin is a highly hydrolysed starch that carries very little intact gluten protein even when wheat-derived. Weigh that against the daily 10 mg gluten tolerance figure and a single tablet cannot plausibly reach it. Sustained use is where it becomes worth resolving, and Gas-X is frequently taken repeatedly by exactly the people whose guts are already unhappy.

Non-celiac gluten sensitivity: effectively a non-issue at these doses.

Wheat allergy: the group with the most reason to ring Haleon before using the chewables, since an allergic response is not dose-dependent in the way celiac mucosal damage is.

One more thing worth saying plainly: if you have celiac disease and you are buying Gas-X regularly, the bloating itself is the thing to investigate. Ongoing gas and distension on a strict gluten-free diet often means continued exposure, SIBO, lactose intolerance or a second condition, none of which are treated by simethicone.

How to resolve it yourself

1. Buy the softgels instead of the chewables. This resolves the question by sidestepping it, costs nothing, and works today. The softgel ingredient list has no grain-derived candidate at all.
2. Call Haleon consumer relations. The number is on the carton. Ask specifically: "What is the botanical source of the maltodextrin and the flavour components in Gas-X Extra Strength chewable tablets?" Naming the two ingredients gets you an answer; asking "is it gluten-free?" gets you a disclaimer.
3. Ask your pharmacist. Pharmacists can query manufacturer excipient databases that carry sourcing detail not printed on the carton, and it is faster than the consumer line.
4. Check the NDC and lot. Excipient sourcing can change between manufacturing runs, so any confirmation you get is strictly speaking about the batch you are holding.

What to have instead

Simethicone is a commodity active. You are not locked into this brand:

Worth knowing: most OTC digestive products are gluten-free in practice. The problem in this aisle is disclosure, not prevalence.

Related questions

Is simethicone itself gluten-free? Yes. Simethicone is a silicone polymer with dimethicone and silicon dioxide, no grain origin exists for it. Every gluten question about an anti-gas product is a question about the tablet or capsule around it, never the active.

Are Gas-X chewables gluten-free? Unconfirmed, and they are the weaker of the two formats. Maltodextrin and "flavors" both appear without a stated source. Almost certainly corn-derived; not confirmed.

Is Gas-X Extra Strength or Ultra Strength different? Only in simethicone dose (125 mg vs 180 mg). The gluten question follows the format, softgel or chewable, not the strength.

Why isn't gluten declared on medicines? The FDA's gluten-free rule covers food. Drug labelling requires inactive ingredients to be named but not their botanical source, so "maltodextrin" is a complete and compliant disclosure that doesn't answer your question. The FDA has issued guidance recommending voluntary gluten statements on drug labels; most manufacturers have not adopted it.

Is Tums gluten-free? Better documented than Gas-X. Haleon's manufacturer copy states all TUMS products have been gluten tested and meet gluten-free guidelines. Confirm on your pack, since the line is large.

Is Midol or Pepto-Bismol gluten-free? Same category, same approach: read the excipients, look for a starch or maltodextrin without a stated source, then ask the pharmacist. Midol has the same unresolved-starch problem as the Gas-X chewables.

How we checked

Overall source tier: C, verdict unverified. We are publishing this unresolved deliberately. The softgels support "no gluten ingredient listed"; the chewables do not support any verdict beyond "unsourced maltodextrin." Neither supports "gluten-free." No national celiac organisation (Beyond Celiac, the Celiac Disease Foundation or Coeliac UK), has published anything on Gas-X, and the Gluten Free Watchdog entry is a testing service's free listing rather than celiac-organisation guidance, so this page has no tier-B backing at all. If Haleon issues a gluten statement for Gas-X, this page moves to tier A and the verdict changes.

Last verified: 10 August 2026. Excipient sourcing changes between manufacturing runs. The carton in your hand, and your pharmacist, outrank this page.