Black tea is allowed to fully oxidize which turns the leaves to dark brown. Black tea is the most consumed and the most popular tea in the world. It contains the highest quantum of caffeine. It is most widely used in making iced tea and English tea. Sweetening agents, spices, chocolate, herbs, milk, ginger, cinnamon, cardamom, lemon grass, mulethi, holy basil (tulsi), etc are added while brewing black tea. Black tea helps in curing digestive disorder, reducing cholesterol level, providing relief from asthma and preventing breast cancer.