Why Regular Soy Sauce Is Not Gluten-Free
Soy sauce is one of the most common hidden gluten traps for people new to a gluten-free diet. Despite being called "soy" sauce, traditional soy sauce is made from a fermented mixture of soybeans AND wheat — usually about 50/50. The wheat is a key component of the flavor development during fermentation.
A tablespoon of regular soy sauce contains significant amounts of gluten — far above the 20 ppm safety threshold for celiac disease. This is why any recipe using soy sauce (stir-fries, marinades, teriyaki, fried rice, sushi dipping sauce, many Asian-inspired dishes) needs to specifically call for a GF alternative.
Your Options for Gluten-Free Soy Sauce Alternatives
1. Tamari
Tamari is a Japanese-style soy sauce made primarily or exclusively from soybeans, without wheat. It originated as a byproduct of miso paste production and has been made in Japan for centuries.
Flavor profile: Richer, more intense, slightly less sharp than regular soy sauce. Many food experts actually prefer tamari's flavor to conventional soy sauce.
Gluten content: Most tamari is naturally wheat-free, but not all brands guarantee it. Always verify by checking the label:
- Traditional Japanese tamari: naturally wheat-free
- American-made tamari: most is wheat-free, but check labels
- "Tamari" branded products: verify — some blended products use small amounts of wheat
Brands: San-J is the most widely recognized certified GF tamari brand in the US. Kikkoman also makes a certified GF tamari.
Best uses: Works identically to soy sauce in every application — stir-fries, marinades, dipping sauces, fried rice, ramen, salad dressings. The flavor is slightly stronger, so you may want to use slightly less.
2. Certified Gluten-Free Soy Sauce
Several manufacturers produce soy sauce specifically formulated without wheat and certified GF:
San-J Organic GF Soy Sauce: Made from soybeans and water only. Certified GF by GFFS. The most popular GF soy sauce in US health food stores.
Kikkoman GF Soy Sauce: Kikkoman, the major Japanese soy sauce producer, makes a certified GF version (tamari-style). Good availability in mainstream grocery stores.
Coconut Secret Coconut Aminos: Not technically soy sauce, but used as a substitute (see below).
3. Coconut Aminos
Coconut aminos are made from fermented coconut tree sap. They're soy-free, gluten-free, and have a flavor somewhat similar to soy sauce but noticeably sweeter and milder.
Flavor profile: Sweeter and less salty than soy sauce or tamari. The soy sauce flavor is less pronounced.
Best for: People who need to avoid both gluten AND soy, or those on paleo diets. Works in most cooking applications but the sweetness changes the flavor profile slightly.
Use more: Because coconut aminos are less salty and intense, use 1.5-2x as much as tamari or soy sauce.
Popular brands: Coconut Secret, Big Tree Farms, Bragg.
4. Liquid Aminos (Bragg's)
Bragg's Liquid Aminos is made from unfermented soybeans and is certified gluten-free. It has a milder, less complex flavor than fermented soy sauce or tamari — some describe it as slightly weaker tasting.
It works adequately in cooking but is less satisfying as a direct flavor replacement for soy sauce compared to tamari.
Choosing the Right Alternative
For the most authentic soy sauce replacement: Tamari (San-J or Kikkoman certified GF) — nearly identical flavor, straightforward substitution.
For soy-free AND GF: Coconut aminos — different flavor profile but works in most applications.
For a budget-friendly option: Buy tamari in bulk from restaurant supply stores or Asian grocery stores.
Substitution Ratios
- Regular soy sauce → certified GF tamari: 1:1
- Regular soy sauce → coconut aminos: 1:1.5 (use 50% more coconut aminos)
- Regular soy sauce → Bragg's Liquid Aminos: 1:1 (but flavor is milder)
Common Sauces and Condiments That Contain Soy Sauce
Once you've swapped your soy sauce, also check these products that commonly contain soy sauce (and therefore gluten):
- Teriyaki sauce — contains soy sauce; make your own with GF tamari or buy certified GF brand
- Hoisin sauce — often contains soy sauce; check labels
- Oyster sauce — some brands contain soy sauce; check labels
- Worcestershire sauce — some brands contain soy sauce
- Many Asian-style marinades and bottled sauces
- Some frozen Asian meals
- Some restaurant dishes, even "simple" ones like grilled chicken that may be marinated
Making Your Own GF Teriyaki Sauce
Simple recipe to replace bottled teriyaki at home:
- 1/4 cup certified GF tamari
- 2 tablespoons honey or maple syrup
- 1 tablespoon rice vinegar
- 1 garlic clove, minced
- 1 teaspoon fresh ginger, grated
- 1 teaspoon cornstarch mixed with 1 tablespoon water
Combine all except cornstarch slurry in a small saucepan, heat until simmering, add cornstarch slurry and cook until thickened. Refrigerate for up to 2 weeks.