Tea and caffeine
According to the USDA, an 8-oz cup of brewed tea contains 25-50 mg of caffeine. Generally speaking, an 8-oz cup of green tea has about 30 milligrams of caffeine, and black tea has around 40 milligrams.
Coffee beans contain less caffeine than tea leaves when measured in their dry form. However, the caffeine content of a prepared cup of coffee is about three times that of a prepared cup of tea. Still, many tea enthusiasts claim that tea gives an equivalent caffeine boost without the jitters. Even decaffeinated tea is not 100% caffeine free. In the US, as long as the caffeine content is not more than 2.5% the product can be labeled "decaffeinated." Moreover, the decaffeination process is said to remove some of the potentially health promoting compounds found in the leaf.
