Purchased from an eye salon I frequent around March 2024. The expiration date is listed as October 2026, but it has already been opened, so please keep that in mind. I used it for about six months and have started using something else, so I'm selling the old one. I feel like the smell of the solution has gotten a bit stronger. I'm not sure how much is left, but it makes a sloshing sound when shaken, so I think there's still some. I can weigh it if you'd like. I have the box, but it's dirty, so I won't be sending it. ⚠️ This is a used item, and secondary use is not officially recommended. Please use it at your own risk. I am not responsible for any problems that may occur after use.