Function and efficacy of lemon slices: Lemon contains sugar, calcium, phosphorus, iron and vitamins B 1, B2, C and other nutrients. In addition, it is rich in citric acid, flavonoids, volatile oil and hesperidin. Citric acid can prevent and eliminate skin pigmentation. Chinese medicine believes that lemon is warm, bitter and nontoxic, and has the functions of quenching thirst, promoting fluid production, relieving summer heat, preventing miscarriage, relieving depression, invigorating stomach and relieving pain, and regulating vascular permeability, and is suitable for mm with edema and puffiness. Smokers should eat more lemons because they need twice as much vitamin C as non-smokers. Lemon has low calorie and strong contractility, which is beneficial to reducing fat and is a good medicine for losing weight. Lemon can prevent cardiovascular arteriosclerosis and reduce blood viscosity. Hot lemon juice and honey are very effective in treating bronchitis and nasopharyngitis. Gandhi moistened lung, quenched thirst with acid, stimulated appetite, detoxified alcohol, whitened skin, moistened skin and lowered cholesterol. The rest of the brewing can be suitable for facial treatment of facial spots and acupuncture.