How Is Astragalus Best Prepared?

There are actually more than 2,000 species of this plant, but two related species--Astragalus membranaceus and Astragalus mongholicus--are most often used in alternative medicine. The root of this plant (the only medicinal part that's used) is brewed in teas, used as extracts, simmered in soups and taken in capsule form. It's often combined with licorice, angelica and ginseng. The herb gained popularity in the U.S. in the 1980s.

Why People Use Astragalus

• In traditional Chinese medicine, this herb is used along with others to help the body's immune system. The Chinese brew Astragalus in a tea to treat chronic hepatitis, common colds, upper respiratory infections, heart disease and cancer.

  A few, but limited, studies show that using Astragalus along with glossy privet helps treat cancer. Small studies also show that using Astragalus may benefit your heart, and help your immune system. It can be used topically for wounds. It is also available as a tincture (extract in liquid alcohol), or as an injectable (in Asian countries only).

How to Take It

• For adults, a standard Astragalus supplement is recommended: 250 to 500 mg, three or four times a day. If used as a tea, make a strong boiled tea from 3 to 5 g of the dried root in 12 oz. of water, and drink the tea three times a day. If used as an extract in 25 percent ethanol, use 2 to 4 ml three times a day.

  Take 500 to 1,000 mg of powdered root three or four times a day, and tincture in 30 percent ethanol (3 to 5 ml) three times per day. Apply a 10 percent ointment to the surface of a wound. Ask your doctor before applying Astragalus ointment to an open wound.

Side Effects and Cautions

• Considered safe for adults, possible side effects are not well known, as Astragalus is most often used in combination with other herbs. It may interact with other medications that suppress the immune system. Other species of Astragalus that grow in the U.S. should be avoided. Be sure and tell your health care provider about any alternative or complimentary practices you use, or supplements you take.