CARBOXY Carbonic Acid Pack, 5 applications. Expiration date: May 8, 2026. I purchased this but am selling it because I haven't had the opportunity to use it. After purchase, it was stored unopened in a dark place at home. Since it has been stored at home for a long time, there may be some dirt or imperfections. Please refrain from purchasing if you are sensitive to such things or are seeking a perfect product. Please understand that this is a home-stored item before purchasing. If you have any questions, please feel free to comment.