21+ Tea Or Coffee Caffeine Levels Pics. Caffeine is a naturally occurring pesticide that's found in both tea and coffee (as the variance in caffeine levels in tea comes from the harvesting and processing of tea. According to stash teas, here is the breakdown in milligrams of caffeine for an average coffee and five types of tea:
Caffeine gives you energy by blocking adenosine, a neurotransmitter responsible for signaling to your brain that it's time to rest.
Dosing subjects with either tea or coffee, one (admittedly small) study found that both beverages left subjects feeling similarly alert later in the morning. Caffeine in tea is fine to drink as part of a balanced diet, but it is best avoided in the afternoon to prevent any disruption to sleep. How much caffeine per day is safe? The caffeine content of tea, by dry weight, is also higher than that of coffee, because a smaller amount of tea is used to brew a single cup, contrasting with caffeine levels vary widely from one particular tea to the next.