Oolong tea is made from the Camellia sinensis plant. Its dried leaves and leaf buds are used to make several different teas, including black and green teas.

Oolong tea is fermented for longer than green tea, but less than black tea. It contains caffeine which affects thinking and alertness. Caffeine works by stimulating the central nervous system, heart, and muscles.

People use oolong tea for mental alertness. It is also used for obesity, diabetes, high blood pressure, autism, and many other conditions, but there is no good scientific evidence to support these other uses.

Don't confuse oolong tea with other caffeine sources, including coffee, black tea, and green tea. These are not the same.

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