Grey Poupon Dijon Mustard is generally considered gluten-free, as it does not contain any wheat or gluten-containing ingredients. The ingredients primarily include mustard seeds, vinegar, water, and salt, which are all gluten-free by nature. However, it is always essential for consumers to check the packaging for the most current information, including potential cross-contamination warnings, as manufacturing practices can change. If someone has sensitivities or allergies, reviewing the ingredient list and any label disclaimers is the best practice. For additional details or updates, looking at the information available on the official Grey Poupon website may provide the latest insights regarding gluten content and other dietary concerns.