it depends
GlutenScan-style answer
Short answer
Regular soy sauce often contains wheat and should not be assumed gluten-free. Some tamari and specially labeled soy sauces may be gluten-free, but you need the ingredient list and allergen statement to know how to treat the actual product.
The answer depends on the exact label, source, allergen statement, and advisory wording.
Why this can be confusing
- Soy sauce recipes vary by brand, country, and product line.
- Some labels say tamari, but tamari is not automatically gluten-free unless the label supports it.
- Soy sauce can also appear as a powder or flavoring inside another packaged food.
What to check on the label
- Wheat, wheat flour, roasted wheat, or hydrolyzed wheat protein in the ingredients.
- Allergen statements such as Contains: wheat.
- A clear gluten-free claim on the exact bottle or package.
- Advisory wording such as may contain wheat or may contain gluten.
How GlutenScan would read it
If wheat is declared, GlutenScan should return unsafe. If the visible label does not show enough context, the cautious result is unknown.
GlutenScan reviews visible label text only. It does not test food, certify products, or detect gluten that is not disclosed on the package.
Want a label-specific answer?
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