special subjects
Astragalus
What are the possible side effects of astragalus?
Most people tolerate astragalus well. But in rare cases, people in astragalus studies have developed minor side effects, including rashes, headache, fatigue, itching, runny nose, nausea, and diarrhea. Some astragalus species that are not included in commercial supplements may be toxic because they contain "swainsonine," an ingredient that is toxic to the nervous system. In animals, this ingredient has caused "locoweed" poisoning. Taking up to 60 grams (about 2 ounces) of astragalus per day for up to 4 months seems to be safe for most people. But studies have not assessed the safety of taking higher doses or taking astragalus supplements for longer than 4 months. (In general, unlike with prescription drugs, there is little evidence about the best dose of supplements.) Not enough research has been done on the use of astragalus by pregnant and breastfeeding women or by children to tell whether this herb is safe for these groups. If, as claimed, astragalus increases activity of the Overview of the Immune System , this could be a problem for people with an 