<<Disclaimer: Verify this information before applying it to your situation.>> Hi all, I just called Toms of Maine and regarding their toothpaste they told me that it is NOT guaranteed gf. The only ingredient in question would be the glycerine which is derived from corn. For people who can eat corn he said there could possibly be contamination as the corn is derived from different sources. So for those who are very careful... erring on the side of caution I changed over to plain old baking soda. Thanks as always to all the wonderful info. you all put across. Janet in Maine