Micellar water in the USA typically doesn’t come with a strict expiration date, but it can degrade over time. Factors such as exposure to air, sunlight, and contaminants can affect its efficacy. It’s generally recommended to use it within six to twelve months after opening to ensure its effectiveness. However, if you notice any changes in color, smell, or consistency, it’s best to discard it, as it may have gone bad. Proper storage in a cool, dark place and keeping the bottle tightly sealed can help prolong its shelf life. Always check the manufacturer’s recommendations for specific guidelines on storage and usage.