HERB PHARM - Astragalus Extract Mineral Supplement - 1 fl. oz. (29.6 ml)DESCRIPTION Supports Healthy Function of the Immune System. We prepare our Astragalus extract from the roots of Astragalus membranaceus plants which are Certified Organically Grown on our own farm without the use of chemical fertilizers, pesticides or herbicides. To assure optimal extraction of Astragalus' bioactive compounds, the roots are hand harvested only in late autumn, are carefully shade dried to maintain their full aroma and color, and are