Kikkoman Gluten-Free Tamari Soy Sauce is a premium tamari soy sauce with the same rich, savory taste and umami flavor youâve come to expect from Kikkoman Soy Sauce. It's traditionally brewed from 4 simple ingredients: water, soybeans, salt and sugar. Non-GMO Project Verified and certified gluten-free by the Gluten Intolerance Group (GIG).