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. It also helps to treat diabetic angiopathy and diabetic retinopathy. Mango tea leaves are very good for this purpose. Soak the leaves in a cup of water overnight. Strain and drink this water to help relieve the symptoms of diabetes. It also helps treat hyperglycemia. The leaves contain a compound called 3beta-taraxerol, and ethyl acetate extract which synergize with insulin to activate GLUT4 and stimulate the synthesis of glycogen.