<<Disclaimer: Verify this information before applying it to your situation.>> I called the company which produces the tooth whitening system called "NITE WHITE / Excel and they assure me it is GF (ALL flavors). I received the information from Heather Cloonan who is the Director of Marketing (and supposedly the person who has thorough knowledge on the manufacturing of the product - also claims to have knowledge of "gluten" ) . Here is the manufacturer and their 800#: Discus Dental 2236 S. Barrington Ave. Los Angeles, CA 90064 (800) 348 - 8806 (BTW: The product CAN produces temporary tooth sensitivity, but that's in anyone - not just Celiacs.) Here's to a pearly white smile! N : )) Nina :) '89FX3/Coupe (SAM) Phoenix, AZ