EVIDENCE-BASED ANSWER
Is Soy Sauce Gluten-Free? What About Tamari?
Usually no. Standard soy sauce is commonly brewed with wheat, so it should not be treated as gluten-free. Tamari is often made with little or no wheat, but the name alone is not a guarantee. Choose a product explicitly labeled gluten-free, then check the ingredient list and allergen statement every time you buy it.
Updated September 17, 2026 · Written and reviewed by the ReGluten Team
Risk table
| Situation | Risk | Why |
|---|---|---|
| Regular soy sauce | High | Usually contains wheat |
| Tamari without a GF label | Medium | Recipe and facility vary |
| Gluten-free labeled tamari | Lower | Verify label and handling |
| Restaurant sauce | High | Recipe and cross-contact may be unknown |
Important exceptions
- Coconut aminos are often wheat-free, but still require a label check.
- A wheat allergen statement is helpful in the US, but barley is not one of the major allergens; a gluten-free claim is clearer.
What to do
- Look for “gluten-free” on the package.
- Read ingredients for wheat, barley, malt, brewer’s yeast, and ambiguous flavoring.
- At restaurants, ask whether regular soy sauce touches the wok, grill, fryer, or utensils.
Sources
Medical note: The information on this page is general and intended to support gluten-free decisions. Always follow the advice of your clinician or dietitian and verify current product labels and regulations.
Frequently asked questions
Is all tamari gluten-free?
No. Many tamari products are gluten-free, but some contain wheat or lack controls needed for a gluten-free claim.
Is low-sodium soy sauce safer?
No. “Low sodium” describes salt, not gluten.
Can I eat soy itself?
Plain soybeans are naturally gluten-free; the concern is ingredients and processing in soy-based products.