Is cornstarch gluten-free?
Yes. Pure cornstarch is made from corn, and corn doesn’t contain gluten. The risk is cross-contact at the mill, so if you’re cooking for someone with celiac disease, buy one labeled gluten-free.
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Updated November 4, 2026
Why cornstarch has no gluten
Gluten is a mix of proteins in wheat, barley, rye and crossbreeds of those grains. Corn isn’t one of them, and the Celiac Disease Foundation lists corn among the foods that are naturally gluten-free. Cornstarch is just the starch from the corn kernel.
When it’s worth checking the label
Naturally gluten-free grains can pick up gluten in the field, the mill or the packing line, if they share equipment with wheat. That’s why the National Celiac Association says to make sure corn flour, cornmeal, masa and cornstarch are labeled gluten-free.
- Look for “gluten-free” on the box. In the US, that claim means under 20 parts per million of gluten. A brand doesn’t need a certification logo to use it, but it has to meet the limit.
- Skip bulk bins. Scoops move between bins. The Celiac Disease Foundation advises against buying grains from them.
- Read mixes. Plain cornstarch has one ingredient. Gravy mixes, baking mixes and “thickeners” have several, and some include wheat flour.
- Watch for “starch” on meat and poultry. On those labels, “starch” or “dextrin” can come from any grain, including wheat. If it doesn’t say which, ask the maker.
How to thicken gravy with it
Cornstarch thickens about twice as much as flour, with no floury taste, and it’s how we make our gluten-free gravy.
- For a gravy that coats a spoon, use about 1 tablespoon of cornstarch for each cup of liquid.
- Stir the cornstarch into the same amount of cold water until smooth. Hot liquid makes it clump.
- Whisk it into the simmering pan and let it bubble for a minute or two. It thickens as it comes to the boil, and it tastes starchy until it has.
- Don’t boil it for long, because the sauce can thin out again. Reheat it gently.
Try it in our gluten-free gravy, or see the whole gluten-free Thanksgiving menu.
Other gluten-free thickeners
| Starch | Good for | Worth knowing |
|---|---|---|
| Cornstarch | Gravy, stir-fry sauces, custard, pie filling | Not for AIP or a corn allergy |
| Arrowroot | Clear, glossy sauces | Fits AIP. Add it at the end, because long cooking thins it |
| Tapioca starch | Pie filling, fruit sauces, baking | Fits AIP. A little chewy if you use too much |
| Potato starch | Soups, gravy, baking | Add it off the boil. Not for AIP, because potatoes are nightshades |
| Gluten-free flour blend | A roux, creamy sauces | Use about twice as much as cornstarch. Blends vary |
If you’re doing AIP, see the AIP diet food list. If you’re cooking for more than one diet, the Gluten app checks each recipe against everyone at the table.
Recipes to start with
Gluten-free gravy
Silky turkey gravy from the pan drippings and stock, thickened with cornstarch instead of flour.
Gluten-free orange chicken
Crispy pan-fried chicken in a sticky orange, garlic and ginger sauce, served over steamed rice with broccoli.
Kids’ plate: Orange chicken bites
Gluten-free green bean casserole
Green beans folded into a creamy from-scratch mushroom sauce and baked, crowned with crunchy rice-flour fried onions.
Cooking for more than one diet?
Add everyone you cook for, with their allergies, diets and ages. Gluten checks every recipe for each of them and tells you what to change for anyone who can’t eat it as written. It’s free.
Questions
Does cornstarch have gluten in it?
No. Gluten is a protein in wheat, barley, rye and their crossbreeds. Cornstarch is the starch from corn. The only way gluten gets in is through contact with those grains during processing or packing.
Can people with celiac disease eat cornstarch?
Cornstarch itself is fine. The National Celiac Association advises choosing cornstarch, corn flour, cornmeal and masa labeled gluten-free, because they can pick up gluten during processing. If you have celiac disease, your dietitian can tell you how careful to be.
Is corn flour the same as cornstarch?
In the US, no: corn flour is whole ground corn, and cornstarch is only the starch. In the UK, “cornflour” means cornstarch. All of them are naturally gluten-free, and all of them are worth buying with the label.
What’s “corn gluten”?
It’s a name sometimes used for a protein in corn. It isn’t the gluten in wheat, and the National Celiac Association says it isn’t harmful to people with celiac disease.
Is cornstarch allowed on AIP?
No. Corn is a grain, so the elimination phase of AIP leaves it out. Arrowroot and tapioca starch are the usual swaps.
What can I use instead of cornstarch?
Arrowroot, tapioca starch and potato starch are all naturally gluten-free and thicken in about the same way. A gluten-free flour blend works too, but you’ll need about twice as much.
Gluten gives food ideas, not medical advice. Recipes are checked against the restrictions you enter, but always check labels for allergens and cross-contact, and talk to your doctor or dietitian about your diet.