Oolong tea is made from the same plant that produces black and green tea, but while black tea is fully oxidized and green tea is not oxidized, oolong is semi-oxidized, then rolled to give it its signature shape. Oolong could be green-ish or brown-ish in color, and the variations in flavors are vast.
Reported Benefits: It’s less-researched than black or green tea, but some studies show oolong tea could help reduce the risk of diabetes. Plus, it comes with a range of antioxidants.
Caffeine? Yes, but typically less than black tea.