Cottonwood leaves are bitter and cold herbs. Chinese medicine believes that Cottonwood leaves enter the liver meridian, gallbladder meridian, lung meridian, large intestine meridian, etc. Taking Cottonwood leaves has the effect of clearing away heat and detoxifying. Because of this nature, in order to avoid taking Cottonwood leaves from damaging health, pungent herbs such as Jiang Banxia are usually added to make drinks, which plays a role in harmonizing the nature. 2. Anti-inflammatory and sterilization < P > Vernonia glycoside is contained in the leaves of South Africa. Vernonia glycoside has a strong anti-inflammatory and bactericidal effect. Taking South Africa leaves in water can kill pathogenic microorganisms, and can also be used to treat diarrhea, dysentery, scabies, malaria, abdominal pain and other symptoms caused by bacterial infection. 3. Lowering blood sugar < P > The effective components in the leaves of South Africa can help to lower blood sugar. People with unstable blood sugar can drink some water from the leaves of South Africa to help lower blood sugar. However, if the blood sugar content is too high, they should go to the hospital immediately and reduce hypoglycemia under the guidance of a professional doctor to avoid delaying treatment. 4. Lowering blood pressure < P > Cottonwood leaves are medicinal materials that blindly clear away heat and toxic materials. Taking Cottonwood leaves can clear away heat and toxic materials, and at the same time, it can also lower blood pressure, which is beneficial to the stability of blood pressure.