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All teas made from Camellia sinensis leaves contain natural levels of caffeine. How the tea is processed, such as black, green, or oolong, determines how much caffeine makes its way into your cup. The decaffeination process can reduce the level of caffeine, but they will not truly be caffeine-free.
There are at least four different ways to decaffeinate tea, each with their pros and cons. At Harney and Sons, we use Carbon Dioxide (CO2), also known as the natural method. This is the healthiest way to remove caffeine, while retaining as much flavor as possible.