Is soy sauce gluten-free?
No, not traditionally — standard soy sauce is brewed from wheat and soybeans, and the wheat carries through fermentation. Tamari is often gluten-free, but not always: some tamari recipes still include a small amount of wheat. The only way to know is the label, or the kitchen — “soy sauce” and “gluten-free soy sauce” are never the same bottle.
Why the wheat is in the brewing, not an add-in.
Traditional soy sauce is fermented from a roughly even mix of soybeans and roasted wheat, using a koji mold culture. The wheat isn’t a garnish or an afterthought — it’s half the base ingredient, present before fermentation even starts. Tamari exists because it developed differently: as the liquid that separates during miso production, which is soybean-based, so many tamari recipes never included wheat to begin with. But “tamari” isn’t a legally protected term that promises zero wheat — some brands blend in a small amount anyway, close enough to the soy-sauce recipe that the label is the only way to tell.
What to say to the kitchen.
Full script for other allergens and diets, in English and Spanish: what to ask your server →
The sauces that travel with soy sauce.
Once soy sauce is on the radar, three more are worth the same question: hoisin sauce and teriyaki sauce are usually built on a soy sauce base, and Worcestershire sauce is traditionally made with malt vinegar — brewed from barley, and not gluten-free either. None of these announce themselves as wheat-adjacent on a menu description.
Sources worth trusting more than us.
- Celiac Disease Foundation — gluten-free foods →
- FDA — gluten-free labeling of foods →
- Gluten Intolerance Group →
Also in The Edit: eating out with celiac, what actually matters, and dedicated gluten-free kitchens across the DMV.
Asked, answered.
Is soy sauce gluten-free?
No, not traditionally. Standard soy sauce is brewed from wheat and soybeans, and the wheat carries through fermentation into the finished sauce. Tamari is often gluten-free but not always. Check the label, or ask the kitchen which bottle is actually on the table.
Is tamari always gluten-free?
No. Most tamari is wheat-free, but some brands and recipes include a small percentage of wheat. “Tamari” on a label is a strong signal, not a guarantee — read for a specific gluten-free claim or certification, or ask the kitchen directly.
What other sauces commonly hide gluten the way soy sauce does?
Worcestershire sauce is traditionally made with malt vinegar, which is brewed from barley and contains gluten. Hoisin sauce, teriyaki sauce, and some marinades also commonly use soy sauce or wheat-based thickeners as a base ingredient without listing “wheat” in the dish name.
We’ve sourced this in DC, Maryland and Virginia. Here’s what cleared. More cities as we open them. The wheat-in-soy-sauce fact holds at any table, anywhere — the kitchens we’ve actually vetted for gluten-free service, so far, are DMV ones. Always confirm with the kitchen.