Several everyday condiments contain gluten, sometimes in obvious ways and sometimes hidden deep in the ingredient list. Soy sauce is the biggest offender, but gluten also shows up in malt vinegar, many gravies, some salad dressings, teriyaki sauce, and certain mustards. Knowing which condiments to watch for, and which sneaky ingredient names to look out for, makes navigating the condiment aisle much simpler.
Soy Sauce: The Most Common Culprit
Traditional soy sauce is made from four ingredients: water, soybeans, wheat, and salt. Wheat is a core part of the recipe, not a minor additive. During brewing, fermentation breaks gluten proteins into smaller fragments, but fermentation does not remove gluten. The exact gluten level in the finished product can’t be reliably measured using standard testing because the fragments behave unpredictably in those tests. What matters is that the wheat is there, and gluten residues above 20 parts per million (the FDA’s threshold for “gluten-free” labeling) are considered a risk for people with celiac disease or wheat allergy.
This means any condiment built on soy sauce is also a concern. Teriyaki sauce, stir-fry sauces, marinades, and many Asian dipping sauces all typically use soy sauce as a base ingredient.
Malt Vinegar and Barley-Based Sauces
Malt vinegar is made from barley and is not distilled, which means it retains gluten and is not safe for people with celiac disease. You’ll find malt vinegar in many barbecue sauces, pickled products, and fish-and-chips-style condiments. Some Worcestershire sauces also list malt vinegar as an ingredient.
Plain distilled vinegar, on the other hand, is gluten-free even when the original grain contained gluten. The distillation process removes gluten proteins entirely. Apple cider vinegar, white wine vinegar, and red wine vinegar are also naturally gluten-free. So the type of vinegar matters: malt vinegar is the one to avoid.
Gravies, Cream Sauces, and Roux-Based Condiments
Any gravy or sauce thickened with wheat flour contains gluten. This includes most traditional brown gravies, cream-based pasta sauces, and béchamel. Packaged gravy mixes and gravy packets almost always use wheat flour or wheat starch as the primary thickener.
Even condiments you wouldn’t think of as “thick” sometimes rely on wheat-based thickeners. Modified food starch is a common additive used to stabilize or thicken bottled sauces, dressings, and marinades. It can be made from corn, potato, tapioca, or wheat. In the United States, when wheat is the source, the label must declare it as “modified wheat starch” or “modified food starch (wheat).” If the label simply says “modified food starch” with no wheat callout, it’s made from a non-wheat source and is safe.
Salad Dressings and Marinades
Most basic vinaigrettes (oil, vinegar, herbs) are naturally gluten-free, but creamy and flavored dressings are more complicated. Some bottled dressings use wheat-based thickeners, malt vinegar, or soy sauce to build flavor. Caesar dressing, Asian-style sesame dressing, and honey mustard dressing are frequent offenders because their recipes often call for soy sauce or malt-based ingredients.
Marinades sold in bottles deserve the same scrutiny. Teriyaki marinades, Korean BBQ sauces, and many “steak” or “grilling” sauces contain soy sauce or barley malt extract.
Mustard and Other Surprises
Plain yellow mustard, Dijon mustard, and most stone-ground mustards are gluten-free. Mustard seeds, vinegar, water, and spices contain no gluten. The exception is certain English-style mustard powders and prepared mustards that use wheat flour as a filler or thickener. Always check the ingredient list on mustard powder, especially imported brands.
A few other condiments catch people off guard:
- Hoisin sauce typically contains wheat, similar to soy sauce.
- Oyster sauce may include wheat-based soy sauce or wheat starch.
- Some ketchups and barbecue sauces use malt vinegar or wheat-derived thickeners, though most major U.S. ketchup brands are gluten-free.
- Dry seasoning blends and rubs occasionally contain wheat flour or barley malt as anti-caking agents or flavor enhancers.
How to Read the Label
In the United States, the FDA requires that any product labeled “gluten-free,” “no gluten,” “free of gluten,” or “without gluten” must contain less than 20 parts per million of gluten. That 20 ppm threshold is the standard across most countries and is considered safe for the vast majority of people with celiac disease.
When a product doesn’t carry a gluten-free label, scan the ingredient list for wheat, barley, rye, malt, and brewer’s yeast. U.S. labeling law requires wheat to be clearly identified, either in the ingredient list or in a “Contains: Wheat” statement. Barley and rye, however, are not required allergen declarations, so you need to spot them yourself. Look for terms like “barley malt,” “malt extract,” “malt flavoring,” or “malt vinegar.”
Gluten-Free Swaps That Work
For soy sauce, tamari is the go-to substitute. Tamari is a Japanese-style soy sauce traditionally made without wheat, using only soybeans, water, and salt. It has a similar depth of flavor and works as a one-to-one replacement. Look for bottles specifically labeled gluten-free, since a small number of tamari brands do add a trace of wheat. Coconut aminos are another option with a slightly sweeter, milder taste.
For malt vinegar, use apple cider vinegar or white wine vinegar. For thickened sauces and gravies, cornstarch, tapioca starch, and rice flour all create smooth, glossy results without gluten. Many grocery stores now carry gluten-free versions of teriyaki sauce, barbecue sauce, Worcestershire sauce, and salad dressings, making it easier than ever to find safe options without sacrificing flavor.