The mango leaves are very useful for treating diabetes. The tender leaves of the mango tree contain tannins called anthocyanidins, which help in treating early diabetes. The leaves are dried and powdered, or used as an infusion to treat the same.hese leaves are rich in vitamin C, B and A. They are also rich in various other nutrients. The mango leaves have powerful antioxidant properties as they have a high content of flavonoids and phenols. [ Read: Benefits Of Mango Seeds For Health ]. The health benefits of Mango leaves are: