Is Grey Poupon mustard gluten free?

While the primary ingredients in Grey Poupon are mustard seeds, vinegar, and spices, it also contains wheat flour as a thickener.

If you're looking for a gluten-free mustard option, you'll need to check the ingredient list of other brands. Many mustard brands offer gluten-free varieties, or you can find recipes for homemade gluten-free mustard online.