Is Cornstarch Gluten Free?
Yes — pure cornstarch is naturally gluten free.
Single-ingredient cornstarch is simply washed and dried corn endosperm, so it does not contain gluten, but blends and shared equipment can introduce risk.
Plain cornstarch is gluten free but cross-contact matters.
Corn is a gluten-free grain, and industrial wet milling removes protein, leaving almost pure starch. Problems arise when cornstarch is produced on lines that also handle wheat flour or when it is blended into gravy mixes, powdered sugar, or soup bases.
- Look for brands that test below 20 ppm gluten and note dedicated facilities.
- Store-brand cornstarch is usually safe but verify allergen statements, especially if you have celiac disease.
- Avoid “seasoned” starches or gravy packets unless the full ingredient list is vetted.
Ingredient Analysis
100% corn endosperm
Wet milling removes fiber and protein, leaving pure starch granules that are naturally gluten free.
Cross-contamination
Shared silos, scoops, or packaging lines that also run wheat flour can add trace gluten unless the plant is audited.
Blended mixes
Cornstarch added to gravy, soup, or baking mixes may sit alongside wheat flour, malt, or barley-based flavor packets.
Is it GF/DF/Vegan/Healthy?
Gluten-Free
Corn does not contain gluten; buy certified GF brands to avoid cross-contact.
Dairy-Free
Single-ingredient cornstarch never contains dairy.
Vegan
It is a plant-derived starch with no animal additives.
Healthy
It is pure starch with little nutrition—use as a thickener, not a nutrient source.
What to Look for on Labels
Scan for “modified food starch”
In the U.S. modified food starch usually comes from corn, but wheat-based starch must disclose wheat on the allergen line.
Look for certified GF seals
Brands like Bob’s Red Mill label their cornstarch as gluten free when it tests below 20 ppm.
Beware blends
If the label lists spices, bouillon, or “natural flavors,” assume gluten until proven otherwise.
Cleaner Alternatives
Ready GF baking helpers
When you need more body, swap in gluten-free flour blends that already include starch and xanthan gum.
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