Mannitol, also known as mannitol, is a six-carbon polyol extracted from brown algae cells. It has two configurations, D and L. The L configuration is a synthetic product and does not exist in nature. The D configuration is widely distributed in the plant kingdom. In particular, the content of mannitol in marine brown algae of the Laminariaceae family is very high. Mannitol is a storage substance in brown algae cells. Large brown algae such as kelp are the main raw materials for extracting mannitol. Mannitol extracted from kelp and nicotinic acid synthesized into nicotinic acid mannitol ester have a significant effect on relieving angina pectoris and have a good effect on hyperlipidemia. It can treat high cholesterol, hypertension, arteriosclerosis and other diseases. Mannitol is also a dehydrating agent and can be used in medical treatment. When a 20% solution is injected into the vein, because it is rarely decomposed in the body, it causes a temporary increase in blood osmotic pressure, so that water in the tissue enters the blood, thereby reducing tissue edema. When mannitol is filtered from the glomerulus, it is not easily reabsorbed in the renal tubules, which increases the osmotic pressure of the primary urine in the renal tubules, bringing out a large amount of water and playing a diuretic role. The above information is edited and compiled by Chemicalbook Tongtong.