Tea has caffeine

Yes, tea contains caffeine. All types of traditional tea varieties, like green, black, white, and oolong, come from the Camellia sinensis plant, which naturally contains caffeine. However, the herbal teas are made from plants other than the Camellia sinensis, and generally do not contain caffeine.

How much caffeine a tea contains depends on factors like the type of tea, water temperature, and brewing time. Usually, the black tea contains more caffeine, ranging from 40 to 50 mg per 8-oz serving. On the other hand, oolong tea contains around 40 mg, and green tea contains approximately 20-30 mg.

Even the decaffeinated tea still contains caffeine, generally around 4mg per 8-oz serving. While the tea contains caffeine, the absorption of caffeine from the tea is usually slower than from coffee.