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Inactive Ingredients That May Contain Gluten
The FDA says it knows of no oral medicine sold in the U.S. with wheat gluten or wheat flour added on purpose, so gluten in a medicine is rare. When a wheat source is possible, it’s usually inside an ingredient made from starch, because those don’t have to name the plant they came from. Here’s what to ask about on a medicine label.
Inactive Ingredients to Ask About
- Wheat, barley or rye in any ingredient name, such as “wheat starch”. Plain wheat starch has to be listed by that name.
- Starch with no source named. It shouldn’t be wheat starch, but the label won’t say which plant it is.
- Pregelatinized or modified starch. These can be made from wheat starch, though the FDA says corn or potato is more common.
- Sodium starch glycolate, a disintegrant that can also be made from wheat starch, usually corn or potato.
- Maltodextrin, dextrates, dextrose or maltose. These are broken-down starches and don’t have to name their source.
- Sugar alcohols such as sorbitol, xylitol, maltitol and mannitol, which the FDA also lists as possibly made from wheat starch.
These common inactive ingredients aren’t made from wheat, barley or rye: cellulose, magnesium stearate, silicon dioxide, hypromellose, titanium dioxide, povidone, croscarmellose sodium and gelatin.
How to Verify Gluten-Free Status: A Step-by-Step Process
I won’t sugarcoat it — checking medications for gluten takes effort. But once you have a system, it gets faster. Here’s a process you can use for any new medicine or supplement.
Step 1: Check the Inactive Ingredients List
For OTC medications, the inactive ingredients are listed on the Drug Facts label. For prescription medications, ask your pharmacist for the full inactive ingredient list or look up the medication’s National Drug Code (NDC) number on the DailyMed database maintained by the National Library of Medicine. It shows the labels drug makers send to the FDA for more than 90,000 prescription and over-the-counter products. A listing can be older or newer than your box, so the box in your hand is the one to go by.
Step 2: Scan for Red-Flag Ingredients
If you see a starch-type ingredient with no source named, or any of the others listed above, go to Step 3. If every inactive ingredient is one that isn’t made from a grain, the FDA says a medicine without wheat gluten or wheat flour on its list shouldn’t contain enough gluten to harm a typical person with celiac disease. For a prescription you’ll take every day, it’s still worth confirming with your pharmacist or the maker.
Step 3: Contact the Manufacturer Directly
This is the most reliable step. Call the manufacturer’s medical information line (not general customer service) and ask these specific questions:
- “Does this specific product contain any ingredients derived from wheat, barley, or rye?”
- “What is the source of the starch (or pregelatinized starch) used in this product?”
- “Is this product tested for gluten, and if so, to what level (parts per million)?”
- “Can you provide written confirmation of the gluten-free status?”
The maker’s phone number is usually on the Drug Facts label under “Questions?”. Ask for the answer in writing, such as an email you can show your pharmacist and keep in your records.
Step 4: Talk to Your Pharmacist
Your pharmacist is a critical ally. Let them know you have celiac disease or need to avoid gluten, and ask whether they can add a note to your profile so inactive ingredients get checked when a prescription is filled, especially when the generic maker changes.
Step 5: Re-Verify with Every Refill
This is the step most people skip, and it’s one of the most important. Pharmacies routinely switch generic manufacturers based on price and availability. The same prescription filled last month could come from a completely different manufacturer this month — with entirely different inactive ingredients.
Check your medicine cabinet for gluten
Fifteen common over-the-counter medicines, what each label shows, what to check on the box, and one question to ask your pharmacist. Plus how to check any medicine yourself. You'll also be first to hear when the LGGF scanner app launches.
Common OTC Medications: Brand-by-Brand Gluten Status
We re-checked these ten on November 3, 2026, against each product’s label on DailyMed (the National Library of Medicine’s drug-label database) and the maker’s own website. Most of these makers publish no gluten statement, and most of these boxes don’t say “gluten-free,” so the table says what the label shows instead of calling anything gluten-free. Formulas change, so check the box you actually buy.
| Brand / Product | Category | Status (Nov 2026) | Notes |
|---|---|---|---|
| Advil (Haleon) | Pain Relief | Check your version | Haleon says no gluten is added but doesn’t test the finished product. Tablets and caplets list a starch with no source named, and Haleon’s own pages disagree about Advil PM Liqui-Gels. |
| Tylenol (Kenvue) | Pain Relief | Check your version | No gluten statement from Kenvue. Extra Strength caplets list starches with no source named; Liquid Gels list no starch. |
| Aleve (Bayer) | Pain Relief | Check your version | Bayer adds no gluten but can’t guarantee Aleve is 100% gluten-free (shared facility). Caplets and tablets list no starch. |
| Zyrtec (Kenvue) | Allergy | No gluten ingredients listed | The 10 mg tablet has no starch. Dissolve tabs list a starch with no source named. No gluten statement from Kenvue. |
| Claritin (Bayer) | Allergy | No gluten ingredients listed | Where tablets use a starch, the label data names corn. Bayer’s Claritin site makes no gluten statement. |
| Allegra (Opella) | Allergy | No gluten ingredients listed | DailyMed codes the tablet’s pregelatinized starch as corn. No gluten statement for adult Allegra. |
| Benadryl (Kenvue) | Allergy | No gluten ingredients listed | Ultratabs and Liqui-Gels list no starch; Allergy Plus Congestion lists starches with no source named. |
| Tums (Haleon) | Antacid | Check your version | Many bottles print “Gluten-Free”; Chewy Bites don’t, and one Chewy Bites listing codes its dextrin as wheat starch (possibly a data error). |
| Pepto-Bismol (Procter & Gamble) | Digestive | No gluten ingredients listed | The original liquid lists no starch. Chews list dextrin and maltodextrin with no source named. |
| Imodium A-D (Kenvue) | Digestive | Check your version | Softgels list no starch; caplets list pregelatinized starch with no source named. |
“No gluten ingredients listed” means DailyMed shows no wheat, barley or rye ingredient for that product. It isn’t a gluten test, and other versions of the same brand can differ. “Check your version” means a common version lists a starch-type ingredient with no source named, or the maker adds a caveat.
A critical note about store-brand generics: Walmart’s Equate, Target’s Up & Up, CVS Health, and Walgreens brand medications may use different inactive ingredients than their name-brand equivalents. Even when the brand-name label lists no gluten ingredient, the Equate version has to be checked on its own. Always check the inactive ingredients on the specific store-brand product.
Supplements: What to Look For and Trusted GF Brands
Supplements matter for many people with celiac disease. The NIDDK says your doctor may test you for low levels of certain vitamins and minerals and recommend supplements if you need them, and to talk with your doctor before starting one. Then make sure the one you buy is gluten-free.
Unlike medicines, supplements are covered by the FDA’s gluten-free labeling rule, and they must declare wheat as an allergen. Third-party seals add testing on top of that, if you know what each one means.
Recommended Supplement Brands for Celiacs
Many Pure Encapsulations products are GFCO-certified gluten-free; look for the mark on the bottle. The company says each batch is tested for purity and potency, and its formulas are free from many common allergens.
Thorne says it sends samples of every product to an outside lab each year to check for hidden gluten, using the FDA’s 20 ppm limit. Some Thorne products are also NSF Certified for Sport.
A line sold as hypoallergenic. Allergen claims vary by product, so check each label for a gluten-free claim.
NOW says products with its gluten-free seal are tested to 20 ppm gluten or less. Look for the seal on the product you buy.
Many Garden of Life products are certified gluten-free by NSF. Check for the NSF Gluten-Free mark on the product you buy.
When to Look Closer at a Supplement
A supplement sold in the U.S. has to name wheat on its label, but barley and rye aren’t on the allergen list, so read the full ingredient list for barley, rye or malt. Products bought from overseas sellers may be labeled for another country’s rules, so the U.S. allergen statement can be missing. If you can’t tell what’s in it, ask the maker or choose a certified product.
Common Mistakes When Checking Medications for Gluten
These mistakes come up again and again, and each one is easy to avoid.
- Assuming every starch-type ingredient is corn. Plain wheat starch has to be labeled “wheat starch”, but ingredients made from starch, like pregelatinized starch or maltodextrin, don’t have to name their plant. They’re usually corn or potato, not always. When the source isn’t named and it matters to you, ask.
- Trusting an old list over the box. Formulas change, and lists online often don’t. Go by the Drug Facts on the box in your hand, and ask the maker when a source isn’t named.
- Forgetting about liquid medications and chewables. These often contain flavorings, colorings, and fillers that differ from the tablet version of the same drug. Children’s liquid medications need separate verification.
- Not flagging your pharmacy profile. If your pharmacist doesn’t know you have celiac disease, they won’t think to check inactive ingredients or notify you when a generic manufacturer changes.
- Stopping a medication without consulting your doctor. Don’t stop a prescription over a gluten question. Call your doctor or pharmacist first; they can check the ingredients and, if needed, look for another version.
- Assuming everything from a “gluten-free brand” is gluten-free. Even brands known for gluten-free products may have individual formulas that differ. Check the specific product, not just the brand.
Frequently Asked Questions
No. The FDA’s gluten-free labeling rule only covers food, and the food allergen law behind “Contains: Wheat” doesn’t cover medicines. Plain wheat starch must be listed as “wheat starch”, but ingredients made from starch don’t have to name their source. DailyMed and your pharmacist can help you read the inactive ingredients, and the maker can tell you where one came from.
Pharmacists can identify the inactive ingredients in your medication and may be able to contact the manufacturer on your behalf. However, most pharmacy computer systems do not automatically flag gluten content. Ask your pharmacist to note your celiac diagnosis in your profile and to check inactive ingredients with each fill.
For most people, probably not, according to the FDA. Its high estimate is that wheat starch and other wheat-derived ingredients add no more than 0.5 mg of gluten to a dose of an oral medicine, less than a 30-gram serving of food labeled gluten-free may contain. If you react to very small amounts or have refractory celiac disease, ask your doctor or pharmacist about any wheat-derived ingredient.
Not necessarily. A generic must contain the same active ingredient as the brand, but its inactive ingredients, including starches and fillers, can differ, and each generic maker may use different ones. Check the specific generic you’re given, not just the drug name.
Ask your doctor or pharmacist whether another brand or generic could work. A compounding pharmacy may also be able to prepare your medication with inactive ingredients you’ve checked; your doctor will need to write a prescription for it.
Make Checking Your Medicines a Habit
Checking medicines and supplements for gluten is one of the most overlooked parts of living gluten-free. Gluten in a medicine is rare, but medicine labels don’t have to tell you about it, so the checking falls to you. That’s not fair, but it’s the reality in 2026.
The good news? Once you build your system — flagging your pharmacy profile, bookmarking DailyMed, saving manufacturer contact numbers, and keeping a running list of what you’ve checked — it becomes manageable. You don’t have to figure this out alone. Your pharmacist, your doctor, and resources like the Celiac Disease Foundation are all part of your safety net.
As a nurse and a mom, I believe everyone with celiac disease deserves to take their medications with confidence. Save this guide, share it with your healthcare team, and revisit it every time your medication changes. Your health depends on it. 💚
Check your medicine cabinet for gluten
Fifteen common over-the-counter medicines, what each label shows, what to check on the box, and one question to ask your pharmacist. Plus how to check any medicine yourself. You'll also be first to hear when the LGGF scanner app launches.
