The “Best Use By” Date should appear on the very bottom of the bottle. Typically, the expiration date is three years from the bottling date. The “Best Use By” Date is the time frame that we guarantee the product; however, you should know that as an electrolyte concentrate, the product is shelf-stable in that it doesn’t grow bacteria or lose potency. However, if you have further questions or concerns about expiration dates and the potency of elete, please feel free to give us a call at 800.669.1297 or e-mail us at info@eletewater.com