Is Soy Sauce Gluten-Free? The Surprising Truth (2026)

The Short Answer: Most Soy Sauce Contains Gluten

No, regular soy sauce is NOT gluten-free. Traditional soy sauce (including Kikkoman regular) is made with wheat as a primary ingredient — typically about 50% wheat and 50% soybeans.

This catches many people off guard. Soy sauce seems like it should be safe — it's made from soybeans, right? But wheat is a core ingredient in the fermentation process.

Why Soy Sauce Contains Gluten

Traditional soy sauce is brewed from four ingredients:

The wheat is roasted, mixed with soybeans, and fermented for months. While fermentation breaks down some proteins, enough gluten remains to be unsafe for celiac disease.

Testing has shown regular soy sauce contains well above 20 ppm of gluten — far exceeding the FDA's threshold for "gluten-free."

Gluten-Free Soy Sauce Alternatives

1. Tamari (Best Option)

Tamari is a Japanese soy sauce made with little or no wheat. Look for:

Important: Not ALL tamari is gluten-free. Some brands add small amounts of wheat. Always check the label or scan it with Check Gluten.

2. Coconut Aminos

A soy-free AND gluten-free alternative made from coconut sap:

Coconut aminos are sweeter and milder than soy sauce. Great for those avoiding both soy and gluten.

3. Gluten-Free Labeled Soy Sauce

Some brands now make soy sauce specifically without wheat:

Where Soy Sauce Hides in Food

Soy sauce is in more foods than you think:

How to Check Any Soy Sauce

The fastest way to verify if a soy sauce is gluten-free:

Quick Reference: GF vs. Not GF

The Bottom Line

Regular soy sauce contains wheat and is not safe for celiac disease or gluten sensitivity. Switch to tamari or coconut aminos — they taste just as good and are widely available. When dining out, always ask if the restaurant uses GF soy sauce or tamari, and scan unfamiliar products with Check Gluten to be sure.