Black tea is a type of tea that is more oxidized than oolong, yellow, white and green teas. Black tea is generally stronger in flavor than other teas. All four types are made from leaves of the shrub (or small tree) Camellia sinensis. Black tea, also known as “red tea,” was discovered in China in the mid 17th century. Many years prior, only green and oolong teas were consumed. The story of how black tea came to be is that an army from Jianxi entered the Fujian Province and camped at a nearby tea factory. Black tea is used for improving mental alertness as well as learning, memory, and information processing skills. It is also used for conditions such as headache, both low and high blood pressure, preventing Parkinson disease, and many others, but there is no good scientific evidence to support these uses.