Astragalus

Astragalus has been used in traditional Chinese medicine over centuries to treat various disorders, but there is no high-quality evidence it is effective or safe for any medical purpose.[10][11]

Extracts of astragalus root include diverse phytochemicals, such as saponins and isoflavone flavonoids, which are purported in traditional practices to increase lactation in nursing mothers.[12] There is no valid clinical evidence to indicate such use is effective or safe for the mother or infant.[12] Dietary supplement products containing astragalus extracts may not have been adequately tested for efficacy, safety, purity or consistency.[12] The root extracts of astragalus may be used in soups, teas or sold in capsules.[10]

Although astragalus supplements are generally well tolerated, mild gastrointestinal upset, diarrhea, and allergic reactions may occur.[10][12] Because astragalus may affect regulation of blood sugar and blood pressure, it may be risky for people with blood disorders, diabetes, or hypertension to use it as a supplement.[10] Astragalus may interact with prescribed drugs that suppress the immune system, such as medications used by people being treated for cancer or recovery from organ transplants.[10]

Some astragalus species can be toxic, such as those found in the United States containing the neurotoxin, swainsonine, which causes "locoweed" poisoning in animals.[10] Some astragalus species may contain high levels of selenium, possibly causing toxicity.[10]

Several species, including A. alpinus (bluish-purple flowers), A. hypoglottis (purple flowers), and A. lotoides, are grown as ornamental plants in gardens.