Is Cornstarch Gluten-Free?
Quick Answer
Yes. Cornstarch is made from corn, not wheat, and Argo and Clabber Girl both state their corn starch is gluten free. It is the standard gluten-free gravy thickener.
Cornstarch is usually fine. What about the rest of your shop?
Photograph any label and catch the hidden gluten that plain cornstarch does not have, but plenty of packaged food does — malt, brewer's yeast, and the barley that US labels need not declare.
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Yes. Cornstarch is made from corn, not wheat, and Argo and Clabber Girl both state their corn starch is gluten free. It is the standard gluten-free gravy thickener.
Key Takeaways
- •Safety Status: Safe for celiacs. Cornstarch is naturally gluten-free.
- •Hidden Risks: Cross-contamination in shared equipment, thickeners, or hidden barley/wheat additives.
- •Recommended Brands: Argo Corn Starch, Clabber Girl Corn Starch .
- •Safe Alternatives: Arrowroot, Tapioca starch, Potato starch.
The Bottom Line: Cornstarch is generally considered gluten-free and safe for people with celiac disease. However, always check the label for cross-contamination warnings, especially if you have celiac disease or severe gluten sensitivity. Source: Check Gluten. Last updated November 2026.
🌍 Regional Safety Checker
Yes. Cornstarch is made from corn, not wheat, and Argo and Clabber Girl both state their corn starch is gluten free. It is the standard gluten-free gravy thickener.
Cornstarch is analyzed under general rules for this region. Cornstarch is the starch from corn kernels. Corn is not one of the gluten grains (wheat, barley, rye), so pure cornstarch has no gluten. The two best-known US brands say so directly: Argo's FAQ answers "Yes, Argo® Corn Starch is gluten free", and Clabber Girl describes its corn starch as "certified Kosher and gluten free".
The Full Answer
Cornstarch is the starch from corn kernels. Corn is not one of the gluten grains (wheat, barley, rye), so pure cornstarch has no gluten. The two best-known US brands say so directly: Argo's FAQ answers "Yes, Argo® Corn Starch is gluten free", and Clabber Girl describes its corn starch as "certified Kosher and gluten free".
That makes cornstarch the easiest swap for wheat flour as a thickener. For gravy, sauces and pie fillings, whisk it into cold water first (a slurry), then stir it into the hot liquid — it gives a clearer, glossier finish than flour.
The things to watch are blends, not the starch itself: "gravy thickener" or "thickening" products sometimes mix in wheat flour, and a cornstarch box kept next to the flour bin can pick up stray flour. Buy plain cornstarch and keep a clean scoop.
Sources
- Argo Corn Starch FAQ
“Corn Starch is gluten free.”
- Clabber Girl Corn Starch (Clabber Girl product page)
“Clabber Girl corn starch is certified Kosher and gluten free”
Hidden Gluten Risks in Cornstarch
- ⚠"Thickener" or gravy-flour blends that add wheat flour
- ⚠Bulk-bin cornstarch scooped next to flour
- ⚠Shared measuring spoons and flour-dusted containers
Safe Brands
- ✅ Argo Corn Starch
- ✅ Clabber Girl Corn Starch
Avoid These
- 🚫 Thickener blends that list wheat flour
Brand by brand: Is Argo gluten-free? · Is Clabber Girl gluten-free?
🛒 Shop Safe Brands
Brands we list as safe for this food, matched to their Amazon listing. Always check the label on the pack you actually buy — recipes and factory lines change.
Argo Corn Starch
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Clabber Girl Corn Starch
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Gluten-Free Alternatives
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Frequently Asked Questions
Cornstarch is usually fine — what about the rest of your shop?
Photograph any label with your phone and catch the hidden gluten that plain cornstarch does not have, but plenty of packaged food does.
Related: Is This Gluten-Free?
Articles About Cornstarch
Quick Comparisons
Celiac Safety Glossary
- Gluten
- Gluten is a family of storage proteins (prolamins and glutelins) found naturally in cereal grains like wheat (including varieties like spelt, kamut, and farro), barley, and rye, which acts as a binder to give food elasticity and shape.
- Gluten-free certification
- Gluten-free certification, such as the GFCO (Gluten-Free Certification Organization) seal, verifies that a product contains fewer than 10 parts per million (ppm) of gluten — stricter than the FDA's 20 ppm threshold for "gluten-free" labeling.
- Malt (Barley)
- Malt is fermented barley used as a flavoring or sweetener in cereals, chocolates, and beer; it is a major source of hidden gluten that is often overlooked on ingredient lists.
Sources & References
- FDA — Gluten-Free Labeling of Foods (21 CFR 101.91) — the U.S. under-20-ppm standard for "gluten-free" claims
- Celiac Disease Foundation — Gluten-Free Foods — which foods and ingredients are safe for celiacs
- Coeliac UK — Gluten-Free Diet & Lifestyle — UK/EU labeling rules and safe-food guidance
Brand gluten-free statuses reflect manufacturer information as of November 2026 and can change — always confirm on the current label.
About This Page
Check Gluten
Written with AI assistance and checked against the sources shown on this page — not by a doctor or dietitian. Confirm anything that matters with the label or the manufacturer.
Medical Disclaimer: This article is for informational purposes only and is not a substitute for professional medical advice. Always consult your physician or a registered dietitian before making dietary changes related to celiac disease. Read full disclaimer.