Grey Poupon, like many other types of mustard, can indeed be stored in the refrigerator. Refrigeration helps maintain its flavor and quality over time. While Grey Poupon may remain safe to consume for a period without refrigeration, keeping it chilled can prevent spoilage and preserve its distinct taste longer. Once opened, it is generally recommended to refrigerate the mustard to ensure it stays fresh. Additionally, storing it tightly closed in its original container is advisable to avoid contamination. For specific storage recommendations, it may be beneficial to consult the product label. Customers interested in detailed guidance on storage and shelf life can also check the current web page for further information.