Black tea is the most common form of tea worldwide. Millions of people enjoy black tea as a dietary supplement. It is also known as wake up tea. Black tea is used to describe a cup of tea without milk. Black tea is prepared from green tea leaves, which have been allowed to oxidize, or ferment, to form a reddish brew. It is stronger in taste and contains more caffeine as compared to other oxidized teas. Thus Caffeine is a very important part of black tea. Black tea is full of various nutrients such as amino acid theanine, the minerals calcium, magnesium, manganese and potassium, and the vitamins C and K. They are offered with different flavors like chocolate, mint, hazelnut, etc., fruit flavors like mango, apple cinnamon, apricot, cranberry, spiced flavors like peaches, ginger, cinnamon etc. for delicious tastes and are available in bricks and tea bags.