Cornstarch vs Tapioca:
Which Is Gluten-Free?
The two starches that replace wheat flour as a thickener in gluten-free cooking. Both are naturally gluten-free; the risks are blends and shared scoops, not the starch itself.
Only after one of them? Is Cornstarch Gluten-Free? or Is Tapioca Gluten-Free?
Good news: both Cornstarch and Tapioca are generally gluten-free.
Verdicts last reviewed July 2026 · based on FDA gluten-free labeling rules and Celiac Disease Foundation guidance
Good news: both Cornstarch and Tapioca are generally gluten-free.
Cornstarch
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.
Watch out for:
- "Thickener" or gravy-flour blends that add wheat flour
- Bulk-bin cornstarch scooped next to flour
- Shared measuring spoons and flour-dusted containers
Tapioca
Yes. Tapioca is pure starch from the cassava root, and Bob's Red Mill sells it as a gluten-free flour. Check boba drinks and puddings for other ingredients.
Watch out for:
- Bubble tea syrups, toppings and add-ins
- Ready-made tapioca pudding with other ingredients
- Tapioca products packed in facilities that handle wheat
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