Traditional Chinese medicine believes that laver is cold, sweet and salty, and enters the kidney and bladder meridian, which has the functions of clearing heat and promoting diuresis, resolving phlegm and softening hardness, tonifying kidney and nourishing heart, removing fat and lowering blood pressure, and is suitable for scrofula, goiter, lymphadenopathy, hyperlipidemia, atherosclerosis, lobular hyperplasia of breast, cancer and so on. Modern medical nutrition research believes that laver is rich in nutrients, including protein, fat, sugar, vitamins and mineral elements, among which protein is high, close to soybean, and easy to be digested and absorbed by human body. Its fat content is not high, and it mainly contains unsaturated fatty acids and eicosapentaenoic acid (EPA), so it has the functions of lowering cholesterol and preventing thrombosis, which is beneficial to the prevention and treatment of hyperlipidemia, atherosclerosis, coronary heart disease and obesity. It contains carotene, nicotinic acid, vitamin B 1, vitamin B2, vitamin C and so on. Among them, the carotene content is as high as per 100 g laver 1370 mg, which has good protective effect on blood vessels; Porphyra is rich in iodine, calcium, phosphorus, iron and zinc. In particular, zinc supplementation with laver can change and improve the ratio of zinc to cadmium, which is beneficial to the prevention and treatment of hypertension. However, laver is cold and the spleen and stomach are weak, so it should be used with caution or less.