Black tea is made from the leaves of a bush called Camellia sinensis . A process called oxidation turns the leaves from green to a dark brownish-black color. Oxidation means the leaves are exposed to moist, oxygen-rich air.
Many people drink black tea for alertness and energy. There is good scientific evidence to show this works. Black tea has a lot of caffeine. It also contains a little bit of a stimulating substance called theophylline. Both can speed up your heart rate and make you feel more alert.
Regularly drinking black tea may also lower your risk for these conditions:
- Diabetes
- High cholesterol
- Kidney stones
- Parkinson’s disease
Black tea extract is sold as a supplement. Sometimes, the supplement includes other types of herbs, vitamins , or minerals
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