One tea with high levels of caffeine, higher than green tea.
Very rich in anti oxidants and according to studies, regular consumption of black tea can prevent diabetes, different kinds of cancer, high cholesterol, Parkinson disease and gall stones.
It is commonly used to cure diarrhea.
Due to its anti oxidants, it increases body thermogenesis, hence it helps also in fat burn.
Drink it as a tea, up to 3 glasses a day.