Black tea is an infusion of dried leaves from plants of the Theaceae family. Due to the alkaloid caffeine, its main effect is stimulation. Black teas also contain other phytochemicals such as flavonoid and flavonoid-related compounds with strong antioxidant effects. They also attenuate atherosclerotic inflammation, reduce thrombosis, promote normal endothelial function, and block expression of cellular adhesion molecules. Black tea may reduce the risk of cancer, heart diseases, infectious diseases, and degenerative diseases.