ASTRAGALUS: AN UNIQUE HERB Astragalus has been used as an immunity booster in China for nearly 4,000 years, according to Rob McCaleb, founder of the Herb Research Foundation in Boulder, Colorado. Belonging to the Leguminosae family, Astragalus membranaceus is one of the most frequently used food supplements and remedies in China. Herb specialists call it an adaptogen, a type of nontoxic natural substance that helps the body maintain its normal balance of health and wholeness as defined by Dr. I. I. Brekman of the Institute of Biologically Active Substances, Academy of Vladivostok, Russia. "Make up energy and redress balance" is the most central quality of Astragalus. Chinese often keep it in their water container to get the tonic effect constantly. Analysis shows that Astragalus contains polysaccharides, monosaccharides, flavonoid, alkaloid, including choline and betaine, folic acid, various amino acids, mucoitin, gum, cellulose, picrorhiza, and fourteen mineral trace elements, including selenium, zinc, iron, etc, which are inperative for man and animals. It is believed and used in Chinese traditional medicine for its following pharmacological functions: 1.  It strengthens immunity to disease. It has certain inhibiting effects on molecular pathological changes caused by viruses, increases growth of plasma cells, stimulates synthesis of antibodies, and builds up body defense. 2.  It deters aging process and facilitates longevity. It delays the natural aging process of diploid blastocyte, prolonging by one third the life span of the cells. 3.  It enhances body energy. It promotes metabolism of serum and liver proteins, stimulates growth of antibodies, increases white blood cells, and thus increases resistance to viruses. It also induces production of interferon. 4.  It is diuretic, detoxicating and reduces proteinuria and cures kidney disease. 5.  It inhibits gastric secretions, reduces gastric acid, and thus helps cure stomach ulcers. 6.  It is cardiotonic. It has even more remarkable effects on heart failure due to poisoning or exhaustion. 7.  It protects the liver and alleviates liver injury caused by stilbenemidine. 8.  It relieves impotence and frigidity. Numerous scientific studies have confirmed the medicinal value of astragalus. Immunopharmacology (1990;20) and Mutation Research (1992) found enhancement response by Astragalus extract, Journal of Ethnopharmacology (1990) reported a hepatoprotective effect and indicated that ethanol extract of Astragalus alleviates liver injury, Archivos del Instituto de Cardiologia de Mexico (1993) announced the vasodilator and antihypertensive properties of Astragalus extract. Since the 1950s, scientists have discovered the potential use of Astragalus for treatment of cancer (The Journal of Urology 1991;146:486-490). Investigations conducted by institutions for cancer research indicated that in areas where selenium content in foods is high, rate of stomache cancer, liver cancer, lung cancer, bladder cancer, colon cancer, etc, is low. Selenium content prevents cell damage caused by hydrogen peroxide and oxidative lipids. Antioxidation effect of selenium is 500 times that of vitamin E. Recently the immunity enhancing properties of Astragalus have led medical scientists to use it in experiments of AIDS treatment (Virology, March 1992). It is considered one of the most promising herbs.