<<Disclaimer: Verify this information before applying it to your situation.>> I got 1 response from the list,she wasn't sure about the modified food starch either but suggested that it could have been the buckwheat pancake mix, did I use Arrowhead pancake mix? It has gluten in it? I did not use the pancake mix, but I did use plain buckwheat flour from Arrowhead Mills. I emailed the Meadows Gold Dairies, and got a very fast response: Betty, Our buttermilk and its ingredients are gluten free. I have attached a list of gluten free products that are manufactured in Salt Lake City, Utah, by Meadow Gold Dairies. Please note that products do vary from location to location, so you need to make sure that the products that you are buying, in this case buttermilk, came from our plant. The plant code # for us is 49-07, which should be printed on the cartons next to the best by date. I hope this helps. Sincerely, Max Torres Q.A. Manager GLUTEN FREE PRODUCTS LIST MEADOW GOLD DAIRIES SALT LAKE CITY, UTAH. PLT 49-07 1. Sour cream 2. Buttermilk 3. Whipping cream 4. Heavy Whip 5. Half & Half 6. Skim Delight 7. Ice Cream mix 8. Milk 9. Chocolate milk 10. Cottage cheese (manufactured in Boise, ID.) 11. Strawberry milk. 12. Egg Nog. So I know it was not the buttermilk, back to square one again :)) *Please provide references to back up claims of a product being GF or not GF*