According to the USDA National Nutrient Database, oolong tea contains trace amounts of vital vitamins and minerals such as calcium, manganese, copper, carotin, selenium, potassium, and magnesium. Oolong blocks the release of the enzymes that break down fats so they can be stored. Instead, the fats pass through you, undigested. As you absorb less dietary fat, the body burns its supply of stored fat for energy. Researchers have found that oolong tea can cut fat storage by up to 50%