Dextran can be used to replace part of whole blood during transfusion, and gels made of dextran are commonly used for biochemical separation. Dextran is a homopolysaccharide composed of glucose as monosaccharide. Some studies have shown that β-glucan can promote the production of lgM antibody in the body, which can improve the immunity of body fluids; it can also restore the ability of lymphocytes synthesizing cytokines in the injured body, which can effectively regulate the immune function of the body. In the process of blood transfusion, dextran can also replace part of the whole blood, as a substitute plasma. Besides, β-glucan can also play a role in anti-radiation, dissolving cholesterol, removing free radicals, preventing hyperlipidemia, and resisting infections caused by bacteria and fungi, etc.; β-glucan can also be widely used in food, pharmaceutical, cosmetic and other industries. Patients who need to use β-glucan treatment are recommended to use it under the guidance of a doctor.