Is Soy Sauce Gluten-Free?

From The New Day Notebook · Facts last checked October 21, 2026 · General information, not medical advice

Most soy sauce is not gluten-free. While it is made from soybeans, the traditional brewing process also uses wheat, which means the final product contains gluten.

You can still enjoy the savory flavor of soy sauce on a gluten-free diet. The key is to look for bottles that are specifically labeled “gluten-free.” The U.S. Food and Drug Administration regulates this label, so it provides a reliable way to find a suitable product.

Soy sauce and gluten at a glance

Why soy sauce has gluten

The reason most soy sauce contains gluten is simple: wheat is a primary ingredient. The classic method for making soy sauce involves fermenting a mixture of soybeans and wheat. This process creates the sauce’s characteristic dark color and complex, savory flavor. Because wheat is used, gluten is present in the final liquid.

For people who must avoid gluten for medical reasons, such as celiac disease, this makes conventional soy sauce unsuitable. The Celiac Disease Foundation includes traditional soy sauce on its list of common foods that contain gluten. Any product made in the United States and labeled “gluten-free” must contain less than 20 parts per million of gluten, a standard set by the FDA.

Where soy sauce can be a hidden ingredient

Soy sauce is a staple in many kitchens and restaurants, so it is important to be aware of where it might appear. It is often a base ingredient in other sauces and prepared foods, making it a frequent source of hidden gluten. When you are reading labels at the grocery store or eating out, pay close attention to the ingredient lists of prepared meals and sauces.

Common items that often contain soy sauce include:

• Marinades for meat, poultry, or fish
• Stir-fry sauces
• Teriyaki sauce and glazes
• Many salad dressings, especially Asian-style vinaigrettes
• Dipping sauces served with appetizers

When dining at a restaurant, it is always a good practice to ask your server if soy sauce is used in a dish you want to order. Inquire about how marinades and sauces are prepared to ensure your meal is gluten-free.

Gluten-free swaps that work

Finding a delicious, gluten-free substitute for soy sauce is easier than ever. Two excellent alternatives are widely available and provide a similar savory, umami flavor for your cooking.

Tamari is a Japanese sauce that is also made from fermented soybeans. While some brands may contain small amounts of wheat, many are made with only soybeans, water, and salt. Tamari that is produced without wheat is gluten-free. The Celiac Disease Foundation recognizes tamari made without wheat as a gluten-free food. Always check the bottle for a “gluten-free” label to be certain.

Coconut aminos are another popular gluten-free alternative. This sauce is made from the fermented sap of coconut palm trees and salt. It is soy-free and gluten-free, with a slightly sweeter and milder flavor than traditional soy sauce. It works well as a direct substitute in dressings, marinades, and stir-fries. As with any packaged food, confirm it is labeled “gluten-free” before purchasing.

When to loop in your doctor or dietitian

People with celiac disease require a strict gluten-free diet for their health. If you are experiencing symptoms or have other health concerns, talk to your doctor or a registered dietitian. Do not begin a gluten-free diet before completing medical testing for celiac disease, as the tests require gluten to be present in your system to be accurate.

• If you think gluten is making you unwell, ask about celiac disease testing before cutting gluten out: testing needs gluten in the diet
• If you have celiac disease and still have symptoms on a gluten-free diet
• If you are unsure whether oats, wheat starch or a specific ingredient suits you
• For help planning a gluten-free diet that still meets your nutrition needs

Sources

• Celiac Disease Foundation: Sources of Gluten
• U.S. Food and Drug Administration: Gluten-Free Labeling of Foods

Last checked October 21, 2026. Recipes and ingredients change: always read the current label.