Black tea is a variety of tea that is more oxidized than the oolong, green, and white varieties. The leaves are dried and fermented, which gives the tea a darker color and richer flavor than green tea. Black tea contains healthy amount of caffeine that help you alert the mind. Furthermore black tea contains a number of antioxidants, which are compounds that help the body fight free radicals. These antioxidants include quercetin, a substance said to combat inflammation and support healthy immune function.