<<Disclaimer: Verify this information before applying it to your situation.>> When I called Tums, they didn't just simply state that they were not GF. In fact, they stated that they use no Gluten in the making of Tums (and yes, they knew what Gluten was). However, the person I talked to went on to say that some of the natural flavorings "may or may not contain gluten, and if they did it would be in immeasurable quantities." Therefore, the gist was that they could not guarantee gf status but provided enough information so that the consumer could make a decision that they were comfortable with especially as it regards sensitivity. My son has had no problems with Tums.