Lycium barbarum bark is the root bark of Lycium barbarum, and the medicine is dry, sweet and cold in nature, and enters the lung, liver and kidney meridians. Efficacy: it mainly has the functions of purging lung fire and clearing away deficiency heat, and is often used in the following situations: 1: lung heat cough; 2. Bone steaming and fatigue; 3 quenching thirst and annoying heat; 4. Blood-heat bleeding is not suitable for those who have no blood-heat syndrome, deficiency and cold in the middle energizer, or heat in the blood and exogenous diseases. According to the Records of Shengji, Lycium chinense can drink Lycium chinense, cure thirst, and drink water day and night, which is convenient. Lycium barbarum soup in Japanese Medicine Heart Prescription is used to treat thirst, dry lips and dry mouth. This product is taken frequently with gypsum and wheat soup. Modern pharmacological research: Cortex Lycii contains guanidine derivatives, which has hypoglycemic effect. "Information of Traditional Chinese Medicine" reported: Cortex Lycii can reduce the hyperglycemia caused by glucose and adrenaline in mice, and reduce the damage to the morphology and structure of islet β cells in diabetic model rats. In addition, this product also has lipid-lowering and antihypertensive effects, and its antihypertensive effect is related to the central nervous system, which may directly relax blood vessels for blocking sympathetic nerve endings.