No expiration date, per se. The date etched on the bottom glass of your bottles/jars is the date that it was manufactured. We do recommend using our products within 18 months from the manufactured date, based on the shortest ingredient's shelf life.
It's also worth mentioning that hemp extract is naturally anti-microbial and anti-bacterial, further extending the shelf life beyond those parameters. If you are storing the product in a cool, dark place (like a kitchen cabinet), there is no reason they would not last well beyond the 18-month mark.