<<Disclaimer: Verify this information before applying it to your situation.>> A few days ago there were some letters expressing disappointment that the antihistamine Benadryl was not GF. I had been using the Cosco Kirkland Brand //Allergy Medicine which says on the label, compare to active ingredients in Benadryl Ultratabs. I had checked this medicine out some time ago for Gluten content and was told it was OK and have used it a lot this season with no adverse reaction. Just to be on the safe side, after reading the letters from listmates, I called Cosco again and they just called me back to say that the product is (IS) GF. Those of you who want to use Benadryl can feel safe with this product. Renee C.