<<Disclaimer: Verify this information before applying it to your situation.>> I received a lot of varying responses on this question, both yes and no. One person suggested checking on www.glutenfreedrugs.com in the alphabetical listing for specific vitamins, and Flintstone's are not listed there. However, Bugs Bunny chewables are listed there and they're made by the same company. This morning, I called Bayer Customer Support to verify, and their response is that they cannot guarantee Flintstone's Vitamins are 100% GF because they get raw materials from outside vendors. Bayer does not add any gluten to the vitamins. The pregelatinized starch on the ingredients list is corn based. Also, Bayer does not have a GF product list. Hope this helps. *Support summarization of posts, reply to the SENDER not the CELIAC List*