Astragalus membranaceus has a long history of medicinal use as its root. The earliest "Shennong Materia Medica Classic" in China listed Astragalus membranaceus as the "top grade". The Medicinal Rhyme states: "Astragalus membranaceus is used as a medicine to strengthen the body, and has the effects of tonifying qi, strengthening the spleen and stomach, expelling pus and relieving pain, promoting blood circulation and treating critical diseases. It has a significant therapeutic effect on diseases such as superficial deficiency, spontaneous sweating, internal injury due to qi deficiency, mental fatigue, limb weakness, spleen deficiency diarrhea, excessive sweating, qi deficiency prolapse, swelling, and carbuncle. Ancient medical books such as "Records of Famous Doctors" and "Compendium of Materia Medica" all believe that it has the effect of tonifying qi and tonifying deficiency.
Pharmacological studies have found that Astragalus membranaceus contains choline, coumarin, folic acid, amino acids, betaine, saponins, sugars, proteins, riboflavins, flavane compounds, iron, calcium, phosphorus, and various trace elements such as selenium, zinc, copper, and manganese. Sweet in taste, slightly warm in nature, it has the effects of tonifying qi and strengthening the surface, diuresis, strengthening the heart, reducing blood pressure, antibacterial, detoxifying, purulent discharge, promoting muscle growth, strengthening capillary resistance, antiperspiration, and sex hormones. It can treat superficial deficiency, spontaneous sweating, qi deficiency, internal injury, spleen deficiency, diarrhea, edema, and carbuncle. Due to its ability to prevent the reduction of liver sugar, Astragalus membranaceus has a protective effect on the liver, and can promote the increase of white blood cells in the human blood. It can resist the reduction of white blood cells caused by chemicals, radiation, or other reasons, significantly improving the phagocytic function of the monocyte macrophage system and white blood cells. But the main function of Astragalus membranaceus is still to nourish the middle and replenish qi, promote diuresis and reduce swelling, which is most suitable for the syndrome of deficiency, obesity, and swelling.