<<Disclaimer: Verify this information before applying it to your situation.>> After reading and hearing conflicting and confusing statements about Slim-Fast and Atkins products, I decided to check with the companies and found out the following. Slim-Fast products, made by Slim-Fast Foods Company, are NOT gluten-free. It's the "no guarantee" on purchased ingredients situation. On the other hand, ALL flavors of Atkins Ready to Drink Shakes, made by Atkins Nutritionals, ARE gluten-free. However, this does NOT apply to other products made by Atkins Nutritionals as they may contain gluten. Hope this helps. Tom Sullivan