Caffeine is found in all varieties of tea, as it is a natural compound found in the leaves of Camellia sinensis. However, the amount of caffeine varies based on how the leaves are processed after harvest. Green and white teas generally have less caffeine than black tea at the same concentration. The energy you gain from tea is much more well balanced than the effect of coffee. Most people experience none of the jitters or anxiety that come with drinking high levels of caffeine because of the presence of theanine, a natural compound with a calming, relaxing effect. The caffeine in green tea is also metabolized differently, meaning it stays in the body much longer and does not cause a “crash” when the caffeine wears off. Some teas have lower levels of caffeine by nature, such as shiraore and houjicha. These might be good choices for a person with caffeine sensitivities.