The shelf life of SodaStream flavors can vary depending on the specific type of flavor concentrate. Generally, the flavor syrups have a shelf life of approximately one year from the date of production, when stored in a cool and dry place. Once opened, it is advisable to use the concentrate within three months for the best taste and quality. It is important to keep the bottles tightly sealed to avoid exposure to air, which can lead to degradation over time. SodaStream suggests checking for any signs of spoilage or changes in taste before using the syrup. For the most accurate and up-to-date information, including specific shelf life details for each flavor, it is beneficial to refer to the instructions and information provided on the current SodaStream website.